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Method for recovering DEIP in TDI residues

A residue and solid residue technology, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve problems such as reaction system blockage, side reactions, few by-products, product purity, etc.

Inactive Publication Date: 2010-06-02
甘肃银光聚银化工有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The advantage of using a high-boiling point DEIP solvent is that there are few by-products and high product purity; the disadvantage is that the high-boiling point DEIP solvent will have side reactions with phosgene during the reaction process, and the produced by-products will return to the reaction system with the solvent, which will easily cause the reaction system jam

Method used

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Examples

Experimental program
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Embodiment Construction

[0020] The following examples serve to further illustrate the method of the present invention. The spirit and scope of the present invention disclosed above are not limited by these examples.

[0021] The solid residue is ground into granules and then sieved for efficient extraction. It is preferred to pass through a 100-mesh sieve after the particles are pulverized.

[0022] Organic solvents such as methanol, ethanol, benzene, toluene are used in the extraction process, preferably ethanol. Ethanol has the advantages of being non-toxic, non-corrosive, and easy to recycle. The water content in ethanol should be as low as possible. Water in the solvent can increase the corrosion of equipment and affect the separation effect of DEIP.

[0023] Add the pulverized residue and ethanol into the extraction kettle, and then heat to fully extract. In the present invention, the residue and ethanol are heated to 150-250° C. and the pressure is 2-6 MPa. Under high temperature and press...

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Abstract

The invention provides a method for extracting DEIP (diethyl m-isophthalate) from TDI organic residues, which aims to solve the problem of the exploitation and utilization of the TDI organic residues. The method comprises the following steps: taking the TDI residues as a raw material, adopting organic solvent as an extracting agent, and extracting the DEIP in the TDI residues by the organic solvent at certain temperature and under certain pressure. The method is easy to protect environment and utilize resources comprehensively due to the adoption of the low-toxicity organic solvent.

Description

Technical field: [0001] The invention relates to a process method for extracting chemical raw materials from chemical industry residues, in particular to a method for recovering DEIP from residues produced in the rectification process of toluene diisocyanate to solve the problem of development and utilization of TDI organic residues. Background technique [0002] TDI is widely used in the manufacture of polyurethane foams, polyurethane elastomers, polyurethane coatings, and adhesives. TDI synthesis all ends with a distillation step, wherein TDI is separated from by-products, and the ratio of TDI to the residue of this distillation step is 1-20%. Therefore, there is considerable economic incentive to utilize the substances in this residue. In addition to the product TDI in the photochemical process, there are other by-products such as diamine derivatives, urea, and amides. Other by-products mainly remain in the residue, which contains a certain amount of DEIP through analys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/80C07C67/56
Inventor 李贵贤李晓明张义新滕志君毛丽萍范宗良
Owner 甘肃银光聚银化工有限公司
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