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Clean production method of diketene

A technology of clean production and diketene, applied in combustion methods, chemical instruments and methods, solid waste removal, etc., can solve problems such as pollution, environmental pollution, and material loss

Inactive Publication Date: 2015-03-11
ANHUI JINGHE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the treatment of residues is mainly hydrolysis. After recovering acetone and acetic acid, the remaining residues are directly discharged into the environment, which will cause great pollution and waste valuable fuels and effective substances in the residues.
In addition, a large amount of gas is produced during the production of diketene, which is usually discharged directly, which will also cause great material loss and environmental pollution

Method used

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  • Clean production method of diketene

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Effect test

Embodiment 1

[0032] Such as figure 1 Shown, the invention provides a kind of diketene clean production method, comprises the following steps:

[0033] a. 99.8% concentrated acetic acid and 85% dilute acetic acid recovered by the system are prepared in proportion to cracking acid, and 1.8 T of 96% cracking acid is thrown into the cracking furnace. The outlet control temperature of the cracking furnace is 720 degrees and the pressure is -80 KPa. The condensed ketene gas is sent to the polymerization section to obtain 0.846 T of crude diketene, which is then purified by rectification to obtain 0.765 T of finished diketene, and 0.1 T of the first-grade residue is produced.

[0034] b. Fully dilute the primary residue with the pump liquid (the content of crude diketene is 40%, the content of anhydride is 40-50%, and the rest is acetic acid) 1.2T pump liquid is fully mixed and diluted, and sent to the hydrolysis section. Put 1T of dilute acid into the hydrolysis section, and add the first-grade...

Embodiment 2

[0039] a. 99.8% concentrated acetic acid and 85% dilute acetic acid recovered by the system are prepared in proportion to cracking acid, and 1.5 T of 96% cracking acid is thrown into the cracking furnace. The outlet control temperature of the cracking furnace is 730 degrees and the pressure is -85 KPa. The condensed ketene gas is sent to the polymerization section to obtain 0.72 T of crude diketene, which is then purified by rectification to obtain 0.65 T of diketene finished product, resulting in 800 Kg of primary residue.

[0040] b. Fully dilute the primary residue with the pump liquid (the content of crude diketene is 40%, the content of anhydride is 40-50%, and the rest is acetic acid) 1.2T pump liquid is fully mixed and diluted, and sent to the hydrolysis section. Put 1T of dilute acid into the hydrolysis section, and add the first-grade residue dilution solution dropwise at a pressure of 10KPa and a temperature of 165-170°C. The dropping time is 2-3 hours, and the reacti...

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Abstract

The invention provides a clean production method for acetic acid cracking for preparation of diketene. The method comprises the steps of cracking, condensation, absorption, polymerization, distillation, and residue hydrolysis treatment. The method is characterized in that dilute acetic acid is added in the residue hydrolysis section to obtain acetone, acetic acid and secondary residue; the acetone is for recycling, part of the acetone is mixed with the secondary residue to provide heat for fuel production; and acetic acid is subjected to separation, extraction and concentration and enters the cracking section as a production raw material. The invention has the advantages that by optimizing the process and the circular route, the generated waste gas and residue in the production process are digested and absorbed in the system, so as to realize clean production.

Description

technical field [0001] The invention belongs to the technical field of chemical production, and relates to a clean production method for preparing diketene by an acetic acid cracking method. Background technique [0002] Acetic acid cracking method is the main method for preparing diketene at present. Because diketene is a heat-sensitive substance, it is easy to form insoluble high polymers and self-polymers during the synthesis process, and these polymers constitute the main solid residue in the diketene process. The residue mainly contains acetic anhydride, diketene, ketene polymer, etc., and has a pungent odor. At present, the treatment of residues is mainly hydrolysis. After recovering acetone and acetic acid, the remaining residues are directly discharged into the environment, which will cause great pollution and waste valuable fuels and effective substances in the residues. In addition, a large amount of gas is produced during the production of diketene, which is usu...

Claims

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Application Information

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IPC IPC(8): C07C27/00C07C45/57C07C49/08C07C51/56C07C51/087C07C53/08C07C53/12C07D305/12B09B3/00F23G7/02F23G7/06
CPCC07C45/57C07C51/087C07C51/56C07D305/12F23G7/00F23G7/06C07C49/08C07C53/12C07C53/08
Inventor 田家民徐成刚葛恒杰
Owner ANHUI JINGHE IND
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