Production process for producing plasticizer from PTA oxidation residues

A production process and plasticizer technology, which is applied in the production process field of PTA oxidation residue to produce plasticizer, can solve the problems of single reaction product, low raw material utilization rate, low production efficiency, etc., and achieve reduced reaction difficulty and good cooling effect , the effect of improving the utilization rate

Pending Publication Date: 2021-06-01
TAIXING FUCHANG SOLID WASTE TREATMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional practice is to discharge after direct treatment, resulting in waste of resources. Some existing treatment methods have low production efficiency, single reaction product, and low raw material utilization rate. Therefore, it is necessary to design a PTA oxidation residue production increaser with high utilization rate and resource saving Plastic production process

Method used

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  • Production process for producing plasticizer from PTA oxidation residues
  • Production process for producing plasticizer from PTA oxidation residues
  • Production process for producing plasticizer from PTA oxidation residues

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Take Jiaxing Tongkun PTA oxidation residue 1000g (dry basis) into the reactor, add 2001g of octanol, start heating and stirring. When the temperature of the material rises to 184°C, add 3.45g of tetrabutyl titanate catalyst, at this time, the octanol is refluxed with water, wait for the temperature in the kettle to rise to about 220°C and at the same time no water drops are extracted, which is regarded as the end point of the esterification reaction. When it is detected that the acid value of the esterification solution is below 0.5, the esterification reaction is over. When the temperature of the esterification liquid is lowered to 90°C, start to filter to obtain a transparent esterification liquid, and start to enter the rectification step.

[0062] Pour the transparent esterification liquid into the still of the rectification tower. When the vacuum at the top of the tower reaches 0.15kpa, heat the still. When the temperature at the top of the tower rises and stabiliz...

Embodiment 2

[0066] Take Shanghai Yadong PTA oxidation residue 1000g (dry basis) into the reactor, add octanol 2001g, start heating and stirring. When the temperature of the material rises to 184°C, add 3.45g of tetrabutyl titanate catalyst, at this time, the octanol is refluxed with water, wait for the temperature in the kettle to rise to about 220°C and at the same time no water drops are extracted, which is regarded as the end point of the esterification reaction. When it is detected that the acid value of the esterification solution is below 0.5, the esterification reaction is over. When the temperature of the esterification liquid is lowered to 90°C, start to filter to obtain a transparent esterification liquid, and start to enter the rectification step.

[0067] Pour the transparent esterification liquid into the still of the rectification tower. When the vacuum at the top of the tower reaches 0.15kpa, heat the still. When the temperature at the top of the tower rises and stabilizes ...

Embodiment 3

[0072] Take Jiangyin Hailun PTA oxidation residue 1000g (dry basis) into the reactor, add 2001g of octanol, start heating and stirring. When the temperature of the material rises to 184°C, add 3.45g of tetrabutyl titanate catalyst, at this time, the octanol is refluxed with water, wait for the temperature in the kettle to rise to about 220°C and at the same time no water drops are extracted, which is regarded as the end point of the esterification reaction. When it is detected that the acid value of the esterification solution is below 0.5, the esterification reaction is over. When the temperature of the esterification liquid is lowered to 90°C, start to filter to obtain a transparent esterification liquid, and start to enter the rectification step.

[0073] Pour the transparent esterification liquid into the still of the rectification tower. When the vacuum at the top of the tower reaches 0.15kpa, heat the still. When the temperature at the top of the tower rises and stabiliz...

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Abstract

The invention discloses a production process for producing a plasticizer from PTA oxidation residues. The production process comprises the following steps: S1, esterification: adding PTA oxidation residues, octanol and a catalyst into an esterification reactor, heating for esterification, and filtering to obtain an esterification liquid; and S2, rectification: carrying out two-stage rectification on the esterification liquid to separate crude octyl benzoate, dioctyl terephthalate and trioctyl trimellitate, and carrying out ester exchange reaction on the separated crude octyl benzoate and mixed polyol, wherein octanol is used as a cooling liquid in the esterification step. According to the invention, while the PTA oxidation residue is used for producing the dioctyl terephthalate plasticizer, octyl benzoate and a small amount of trioctyl trimellitate can be produced, so that the utilization efficiency of the raw materials is enhanced, the energy is saved, the yield of finished products is increased, and the benefit is expanded; and octanol is used as a cooling liquid, and condensation is carried out while esterification is carried out, so that the maintenance cost of condenser equipment is saved, the cooling effect is good, and the conversion heat efficiency is high.

Description

technical field [0001] The invention relates to the field of chemical waste treatment, in particular to a production process for producing plasticizers from PTA oxidation residues. Background technique [0002] Terephthalic acid is one of the important organic raw materials. With the development of society, the demand for terephthalic acid is gradually increasing. At present, the main method of producing PTA is to oxidize p-xylene at high temperature to obtain terephthalic acid. This oxidation process will produce a large number of oxidation residues, the amount of which accounts for 0.5% to 1% of the PTA production capacity. The components in the PTA oxidation residue are very complex, and the main components are benzoic acid, terephthalic acid, and phthalic acid. , isophthalic acid and other aromatic acids. Conventional practice is to discharge after direct treatment, resulting in waste of resources. Some existing treatment methods have low production efficiency, single r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/08C07C67/03C07C67/48C07C67/54C07C69/78C07C69/80C07C69/76
CPCC07C67/08C07C67/03C07C67/48C07C67/54C07C69/78C07C69/80C07C69/76
Inventor 沈福昌沈建东沈世金张利
Owner TAIXING FUCHANG SOLID WASTE TREATMENT CO LTD
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