Revision as of 12:17, 5 November 2010

Pathways for production of Polyethyeleneterephthalate

Pathways for preparation of PET

Polyethylene terephthalate

Polyethylene terephthalate( (C₁₀H₈O₄)_n) (sometimes written poly(ethylene terephthalate)), is also abbreviated as PET, PETE, or PETP or PET-P)
Some of the trade names of PET products are Dacron, Diolen, Tergal, Terylene, and Trevira fibers, Cleartuf, Eastman PET and Polyclear bottle resins, Hostaphan, Melinex, and Mylar films, and Arnite, Ertalyte, Impet, Rynite and Valox injection molding resins.
The materials that can be prepared using PET are bottles, tapes, films or pulled into fibers that are pressed into meshes or woven into fabrics.

Preparation of Polyethyleneterephthalate

Polyethyleneterephthalate is prepared by reacting Dimethylterephthalate with Ethylene glycol in the presence of a catalyst. Dimethylterephthalate is obtained by treating Terephthalic acid with methanol. The catalyst is a salt of a metal like calcium, barium, cadmium, cobalt, lead, manganese, tin, zinc and chromium and a material selected from the group consisting of hydroxybenzophenone carboxylic acids and hydroxyacetophenone carboxylic acids. Source

(Terephthalic acid) + 2CH₃OH → (Dimethylterephthalate)

(Dimethylterephthalate) + CH₂(OH)CH₂(OH) + Catalyst → (Polyethyleneterephthalate)

Ethylene glycol

Ethylene glycol(C₂H₄(OH)₂), (monoethylene glycol (MEG), 1,2-ethanediol, IUPAC name: ethane-1,2- diol,)
Ethylene glycol is an odorless, colorless, syrupy, sweet tasting, toxic liquid.
It is used as a heat transfer chemical i.e., as a coolant. Due to its low freezing point it is used as a deicing fluid for windshields and aircraft.
Ethylene glycol is widely used to inhibit the formation of natural gas clathrates in long multiphase pipelines. Then ethylene glycol can be recovered from the natural gas and reused as an inhibitor after purification treatment that removes water and inorganic salts.
Ethylene glycol has become increasingly important in the plastics industry for the manufacture of polyester fibers and resins, including polyethylene terephthalate, which is used to make plastic bottles for soft drinks. The antifreeze capabilities of ethylene glycol have made it an important component of vitrification mixtures for low-temperature preservation of biological tissues and organs.
Ethylene glycol may also be used as a protecting group for carbonyl groups in organic synthesis.
Ethylene glycol's high boiling point and affinity for water makes it an ideal desiccant for natural gas production.

Source

Preparation of Ethylene Glycol

Ethylene glycol is prepared in the following ways:

1. From ethylene: Ethylene is oxidized to ethylene oxide. Ethylene oxide upon hydrolysis ethylene glycol is prepared.

7 H₂C=CH₂ + 6 O₂ → 6 C₂H₄O + 2 CO₂ + 2 H₂O

C₂H₄O + H₂O → HOCH₂CH₂OH

2. Ethylene glycol is prepared by reacting formaldehyde with methanol in the presence of organic peroxide(ditertiarybutylperoxide) Source

CH₃OH + HCHO + (CH₃)₃OOC(CH₃)₃→ CH₂(OH)CH₂(OH)

Note: In the above two preparation methods for ethylene glycol we have used ethylene, methanol, formaldehyde. The following are their preparations:

Ethylene preparation:

1. Ethylene is prepared biologically from methionine by using enzymes.Source

Ethylene biosynthesis

2. Ethanol upon dehydrating in the presence of catalyst ethylene is prepared.Source

C₂H₅OH + Al₂O₃(Catalyst) → H₂C=CH₂ + H₂O

Methanol preparation: Biological process

Methanol is prepared through fermentation process. Vegetable materials are fermented anerobically in the presence of Zymomonas mobilis bacteria. In this process ethanol and methanol are the products. Methanol is separated from ethanol by distillation. Source

Formaldehyde preparation:

1. Formaldehyde is prepared enzymatically. In this process the lower alkyl alcohols are converted into lower aldehydes by using oxidase enzymes. Source

2. Formaldehyde is prepared by dehydrogenation of methanol using a catalyst. The catalyst is silver or silver/gold alloy on an inert hard, nonporous support. Source

CH₃OH + Ag (or Ag/Au alloy)(Catalyst) → HCHO + H₂

Ethanol preparation:

Ethanol is prepared by fermentation process.

Ethanol through Fermentation

Terephthalic acid

Terephthalic acid(C₆H₄(CO₂H)₂) is a colourless solid, used principally as a precursor to the polyester PET, used to make clothing and plastic bottles. Several billion kilograms are produced annually. It is one of three isomeric phthalic acids.
Virtually the entire world's supply of terephthalic acid and dimethyl terephthalate are consumed as precursors to polyethylene terephthalate (PET) Source

Preparation of Terephthalic acid

Biological preparation of Terephthalic acid Source

Biological preparation of Terephthalic Acid

Preparation of p-Xylene:

p-Xylene is prepared from toluene in the presence of a catalyst. This is a methylation reaction. The methylating agents are methanol, methyl chloride, methyl bromide, dimethylether or dimethylsulfide. The catalyst used is ZSM-23 zeolite material. Here this catalyst is used for attacking the methyl group in the para position of the toluene. Source

Toluene + Methylating agent + ZSM-23 Zeolite(Catalyst)→ P-xylene

Preparation of Toluene:
1. Toluene is an aromatic extract from the tropical colombian tree Myroxylon Balsamum Source
2. Toluene is prepared from wastes like old trees, cable wastes, polyethylene waster and polypropylene wastes. In this process the waste products are pulverised and heated to a temperature range of 150˚C to 500˚C at a pressure of 20 to 300 bar Source

Note-Today most of the ethylene manufacturers are producing ethylene through petroleum cracking.

Search Strategy

Database - Micropat
We conducted search on concepts that have a biological method of preparation only.
We have not conducted search on production of ethanol (from which we prepare ethylene) since that is not the focus of this project.

NOTE: Explanation of Query Concepts
Query 1 - All Biological Process

Query 2 - Ethanol Fermentation

Final Query - Query 1 + Query 2

Issue/Publication Years: 1836 - Date (9th June 2009)

S.No	Concept	Scope	Search string	Hits
Query 1
1	Bio-Production of Terepthalic acid from Xylene	Full patent spec.	(((4Benzenecarboxylic OR 4Benzenedicarboxylic OR Benzene2para2dicarboxylic OR benzene5dicarboxylic OR Benzenepdicarboxylic OR pBenzenedicarboxylic OR pCarboxybenzoic OR pPhthalic OR ParaPhthalic OR Terephthalic) ADJ acid) OR Acide2terephtalique OR Kyselina*2tereftalova OR Tephthol) OR (terepthalic ADJ1 acid)	102948 hits
2		Claims, Title or Abstract	((bio* OR biological) SAME (prepare OR preparation OR extract OR extraction OR synthesis OR syntheses OR sinthisis OR synthesize OR production OR produce OR making OR manufactur3 OR transformation OR transform OR conversion OR cataly3 OR synthe))	360711 hits
3		Full patent spec.	"1,4-dimethylbenzene" OR "p-methyltoluene" OR "1,4-xylene" OR 5dimethylbenzene OR 5xylene OR *3methyltoluene	507183 hits
4		Combined Query	1 AND 2 AND 3	25(20 Unique hits)

5	Production of Ethylene from Ethanol	Claims, Title or Abstract	Ethanol OR (ethyl ADJ1 alcohol) OR (grain ADJ1 alcohol)	134288 hits
6		Claims, Title or Abstract	(Ethylene OR ethene OR acetene OR (bicarburetted ADJ1 hydrogen) OR elayl OR Etileno OR ethylene* OR ((C2 OR "C.sub.2") NEAR5 olefins))	410332 hits
7		Claims, Title or Abstract	produc5 OR conver5 OR manufactur3 OR synthes6 OR process OR method	13960381 hits
8		Claims, Title or Abstract	(dehydrat* OR (water ADJ1 removal) OR hypohydrat* OR cataly* OR zeolite* OR silica OR alumina OR (trifluoromethanesulfonic ADJ1 acid) OR evaporat* OR desiccation OR drying OR trifluoromethanesulfonicacid OR (water NEAR5 remov*))	1643133 hits
9		Any Classification	C07C OR B01D	1267051 hits
10		Combined Query	5 AND 6 AND 7 AND 8 AND 9	2606 (1863 Unique hits)

11	Production of Ethylene through Biological process	Claims, Title or Abstract	((bio OR biological) SAME (prepare OR preparation OR extract OR extraction OR synthesis OR syntheses OR sinthisis OR synthesize OR production OR produce OR making OR manufactur3 OR transformation OR transform OR conversation OR cataly3)) OR ferment* OR microorganism* OR microb* OR bacteria	360711 hits
12		Claims, Title or Abstract	(Ethylene OR ethene OR acetene OR (bicarburetted ADJ1 hydrogen) OR elayl OR Etileno OR ethylene* OR ((C2 OR "C.sub.2") NEAR5 olefins))	410332 hits
13		Full patent spec.	methionine OR (acc ADJ1 synthase) OR "1-aminocyclopropane-1-carboxylate synthase" OR ACCsynthase OR (2aminocyclopropane*3carboxylate ADJ1 synthase)	60755 hits
14			C12N OR C12P	570454
15		Combined Query	11 AND 12 AND 13	237 (131 Unique hits)

19	Ethylene oxide from ethylene	Claims, Title or Abstract	(Ethylene OR ethene OR acetene OR (bicarburetted ADJ1 hydrogen) OR elayl OR Etileno OR ethylene* OR ((C2 OR "C.sub.2") NEAR5 olefins))	410332 hits
20		Claims, Title or Abstract	oxidation OR produc* OR prepar* OR manufactur* OR convers* OR synthsi*	8311728 hits
21		Claims, Title or Abstract	((Ethylene ADJ1 oxide) OR Epoxyaethan OR Epoxyethane OR Oxidoethane OR (Ethene ADJ1 oxide) OR Oxirane)	59403 hits
22		Any classification	B01J002104 OR B01J002108 OR B01J002304 OR B01J002350 OR C07D30103 OR B01D005304 OR B01J002112 OR B01J002712 OR B01J002708 OR B01J002710 OR B01J002709 OR B01J002308 OR B01J002368 OR B01J0027055 OR B01J002324 OR 00B01J002336 OR B01J002330 OR B01J002300 OR 00B01J2370 OR C07D30110 OR B01J002348 OR B01J2702 OR B01J2714 OR B01J2706 OR C07D30304 OR B01J00236200 OR B01J002366 OR B01D005304 OR B09J002104 OR B09J002108 OR B01J002396 OR B01J003102 OR B01J003100 OR B01J002118 OR B01J00208 OR B09J002112 OR 00B09J002350 OR B01J002302 OR B01J002303 OR B01J002720 OR B01J00231000B01J002378 OR C07D30132 OR B01J002106 OR B01J002396 OR C07D030132 OR C07D030100 OR C07C002910 OR C07C002910 OR C07C002900 OR C07C002909 OR C07C002700 OR C07D030106 OR B01J0027199 OR B01J002714 OR C07C005700	195483 hits
23		Combined query	19 AND 20 AND 21 AND 22	2144 (1167 unique records)

24	Ethylene glycol from ethylene oxide	Ethylene glycol manufacture	(4Dihydroxyethane OR 4Ethandiol OR 4Ethanediol OR GLYCOL OR 4Ethylene1Glycol OR 2Hydroxyethanol OR 2Hydroyethanol OR Aethylenglykol OR Athylenglykol OR Athylenglykol OR Diphyl OR Dowtherm3 OR Ethane4diol OR ethanediol OR Ethylene1alcohol OR Ethylene1Glycol OR Ethylene1glycol OR Fridex OR Glycol1alcohol OR Lutrol19 OR MEG OR Monoethyleneglycol OR Therminol VP OR (ethylene ADJ1 glycol) OR ethyleneglycol)SAME(produc* OR prepar* OR manufact* OR synthe* OR conver*))	75928 hits
25		Any classification	C07D030108 OR C07B006100 OR C07C002948 OR C07C002950 OR C07C003120 OR C07D030103 OR C07D030104 OR C07D030122 OR C07D030300 OR C07D030304 OR C07B006100 OR C07C002900 OR C07C003100 OR C07D030100 OR C07D030300 OR C07C002910 OR C07C002909 OR C07C002700 OR C07C002726 OR C07C002974 OR C07C003102 OR C07C003300 OR C07C003120 OR C07C003118 OR C08G006526 OR B01J003108 OR C07C002980 OR C07C002976 OR C07C004103 OR C07C004310 OR C07C004311 OR C07D030110 OR C07C004100 OR C07C006900 OR C07C006800 OR C07C002900 OR C07C006806 OR C07C0029128 OR C07C002728 OR C07C002702 OR C07C002980 OR C07C002909 OR B01J003106 OR C07C003120 OR C07D031736 OR C07D031738 OR C07D031700	290188 (hits Unique hits)
26		Combined Query	21 AND 24 AND 25	858(591

27	Preparation of benzeneamide from benzene nitrile	Claims, Title or Abstract	(benzonitrile OR (benzene ADJ1 nitrile)OR cyanobenzene OR (cyno ADJ1 benzene ) OR (Benzene ADJ1 cyanide) OR (phenyl ADJ1 cyanide)OR (Benzene ADJ1 carbo ADJ1 nitrile) OR (Benzoic ADJ1 acid ADJ1 nitrile))	41789 hits
28		Claims, Title or Abstract	(microorganism* OR microb* OR bacteria OR yeast OR fungi OR bacteri* OR bioproduction OR biosynthesi* )	339673 hits
29		Full patent spec.	(benzene ADJ1 amide) OR (phenyl ADJ1 amide)OR amide)	143811 hits
30		Combined query	27 AND 28 AND 29	305(162 unique hits)
15	All Combined		4 OR 10 OR 15 OR 23 OR 26 OR 30	5674 (3644 unique records)
Relevancy-25%
Query 2
S.No	Concept	Scope	Search string	Hits
1	Preparation of ethanol from fermentation	Claims, Title or Abstract	ferment* OR zymology OR zymoptic	41789 hits
2		Claims, Title or Abstract	(Hydroxyethane OR (Methyl ADJ1 carbinol) OR (Pure ADJ1 alcohol) OR (Grain ADJ1 alcohol) OR (Ethyl ADJ1 alcohol) OR Ethanol* OR bioethanol* OR (fermentation ADJ1 alcohol) OR methylcarbinol)	339673 hits
		Any classification	C12P OR C12N OR C12F OR C07C OR C07D	305(162 unique hits)
4		Combined query	1 AND 2 AND 3	3905(2207 unique hits)
Relevancy-50%
Final Query
Final Query		Combined query	Query1 + Query 2	9669(5847 unique hits)
Relevancy-30%

Note:The above mentioned benzamide is converted to benzoic acid which is then converted to terephthalic acid.

Benzoic acid to terepthalic acid US2823230
Benzene amide to benzoic acid US5932454A

New search stratergy

S.No	Concept	Scope	Search string	Hits
Query 1
1	Bio-Production of Terephthalic acid	Full patent spec.	(((terephthalic OR Terepthalic) NEAR4 (produce* OR production OR conver* OR synthes* OR biotransformation)) NEAR10 ((plant NEAR5 source) OR biological OR glucose OR fructose* OR sucrose OR starch OR cellulose OR biomass OR waste* OR biotransformation OR feedstock))	152 hits

2	Production of Terephthalic acid from 2,5-furandicarboxylate	Full patent spec.	(4Benzenecarboxylic OR 4Benzenedicarboxylic OR Benzene2para2dicarboxylic OR benzene5dicarboxylic OR Benzenepdicarboxylic OR pBenzenedicarboxylic OR pCarboxybenzoic OR pPhthalic OR ParaPhthalic OR (Terephthalic ADJ1 acid) OR Acide2terephtalique OR Kyselina*2tereftalova OR Tephthol) OR (terepthalic ADJ1 acid)	104258 hits
3		Full patent spec.	"2,5-furandicarboxylate" OR *furandicarboxylate OR (furane ADJ1 dicarboxylate) OR furfurandicarboxylate OR (oxole ADJ1 dicarboxylate)OR (divinyl ADJ1 oxide ADJ1 dicarboxylate)	174 hits
4		Combined Query	2 AND 3	20

5	Bio-Production of Terephthalic acid from Xylene	Full patent spec.	(((4Benzenecarboxylic OR 4Benzenedicarboxylic OR Benzene2para2dicarboxylic OR benzene5dicarboxylic OR Benzenepdicarboxylic OR pBenzenedicarboxylic OR pCarboxybenzoic OR pPhthalic OR ParaPhthalic OR Terephthalic) ADJ acid) OR Acide2terephtalique OR Kyselina*2tereftalova OR Tephthol) OR (terepthalic ADJ1 acid)	102948 hits
6		Claims, Title or Abstract	((bio* OR biological) SAME (prepare OR preparation OR extract OR extraction OR synthesis OR syntheses OR sinthisis OR synthesize OR production OR produce OR making OR manufactur3 OR transformation OR transform OR conversion OR cataly3 OR synthe))	360711 hits
7		Full patent spec.	"1,4-dimethylbenzene" OR "p-methyltoluene" OR "1,4-xylene" OR 5dimethylbenzene OR 5xylene OR *3methyltoluene	507183 hits
8		Combined Query	5 AND 6 AND 7	25(20 Unique hits)
9	Combined Query		1 OR 4OR 8	189 (101 Unique Hits)

Relevancy-10%
Query 2
S.No	Concept	Scope	Search string	Hits
10	Production of Ethylene through Biological process	Claims, Title or Abstract	((bio OR biological) SAME (prepare OR preparation OR extract OR extraction OR synthesis OR syntheses OR sinthisis OR synthesize OR production OR produce OR making OR manufactur3 OR transformation OR transform OR conversation OR cataly3)) OR ferment* OR microorganism* OR microb* OR bacteria	360711 hits
11		Claims, Title or Abstract	(Ethylene OR ethene OR acetene OR (bicarburetted ADJ1 hydrogen) OR elayl OR Etileno OR ethylene* OR ((C2 OR "C.sub.2") NEAR5 olefins))	410332 hits
12		Full patent spec.	methionine OR (acc ADJ1 synthase) OR "1-aminocyclopropane-1-carboxylate synthase" OR ACCsynthase OR (2aminocyclopropane*3carboxylate ADJ1 synthase)	60755 hits
13			C12N OR C12P	570454
14		Combined Query	11 AND 12 AND 13	331

15	Production of Ethylene from Ethanol	Claims, Title or Abstract	Ethanol OR (ethyl ADJ1 alcohol) OR (grain ADJ1 alcohol)	134288 hits
16		Claims, Title or Abstract	(Ethylene OR ethene OR acetene OR (bicarburetted ADJ1 hydrogen) OR elayl OR Etileno OR ethylene* OR ((C2 OR "C.sub.2") NEAR5 olefins))	410332 hits
17		Claims, Title or Abstract	produc5 OR conver5 OR manufactur3 OR synthes6 OR process OR method	13960381 hits
18		Claims, Title or Abstract	(dehydrat* OR (water ADJ1 removal) OR hypohydrat* OR cataly* OR zeolite* OR silica OR alumina OR (trifluoromethanesulfonic ADJ1 acid) OR evaporat* OR desiccation OR drying OR trifluoromethanesulfonicacid OR (water NEAR5 remov*))	1643133 hits
19		Any Classification	C07C OR B01D	1267051 hits
20		Combined Query	15 OR 16 OR 17 OR 18 OR 19	2606 (1863 Unique hits)
20	Final Query		14 OR 20	2936 (2046 Unique hits)
20	Relevency-20%

21	Final Query		Query 1+Query2	3123(2145 unique hits)
Relevancy-15%