High-efficiency environment-friendly ketene dimer production technique

A diketene, production process technology, applied in the field of diketene production, can solve the problems of increasing the processing cost and the pressure of environmental protection, affecting the quality and yield of diketene, and achieving the goal of reducing gas desorption, reducing the generation of polymers, and increasing solubility Effect

Active Publication Date: 2015-01-07
南通宏信化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The shortcoming of above-mentioned acetic acid cracking method to produce diketene technology is: one, in the acetic acid cracking process can produce more by-products such as carbon monoxide, carbon dioxide, methane; High polymers such

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Feeding 2500L / h of acetic acid aqueous solution with a mass concentration of 93% is vaporized into acetic acid gas by the acetic acid vaporizer, and then preheated to 520°C through the acetic acid preheating section. As a catalyst, the catalyst is mixed with acetic acid gas and gasified and enters the cracking furnace together. The temperature of the cracking furnace is controlled at 695°C. The acetic acid gas is cracked in the cracking furnace to produce ketene gas, water vapor and by-products such as carbon monoxide, carbon dioxide, and methane. . The outlet pressure of the cracking furnace is an absolute pressure value of 10KP. The gas exiting the cracking furnace is cooled and separated to remove water vapor and unreacted acetic acid, as well as acetic acid and acetic anhydride produced during the reaction process. The purified ketene gas is transported backward through a vacuum pump. The pre-pump pressure of the vacuum pump is controlled to an absolute pressure val...

Embodiment 2

[0021]Feeding 2000L / h of acetic acid aqueous solution with a mass concentration of 92% is vaporized into acetic acid gas by the acetic acid vaporizer, and then preheated to 560°C through the acetic acid preheating section. As a catalyst, the catalyst is mixed with acetic acid gas and gasified and enters the cracking furnace together. The temperature of the cracking furnace is controlled at 698°C. The acetic acid gas is cracked in the cracking furnace to produce ketene gas, water vapor and by-products such as carbon monoxide, carbon dioxide, and methane. . The outlet pressure of the cracking furnace is an absolute pressure value of 8KP. The gas exiting the cracking furnace is cooled and separated to remove water vapor and unreacted acetic acid, as well as acetic acid and acetic anhydride produced during the reaction process. The purified ketene gas is transported backwards by a vacuum pump. , control the pressure before the pump of the vacuum pump to an absolute pressure value ...

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Abstract

The invention discloses a high-efficiency environment-friendly ketene dimer production technique which comprises the following steps: (1) gasifying an acetic acid water solution into acetic acid gas, mixing with a catalyst phase, and cracking in a cracking furnace at 680-698 DEG C to generate ketene gas, wherein the outlet pressure of the cracking furnace is controlled at the absolute pressure value of 2-20 KP; (2) delivering the purified ketene gas to an absorption unit with a vacuum pump, wherein the pressures before and after the pump are respectively 2-20 KP and 100-120 KP, and the temperature difference change of the absorption liquid is controlled to be less than 10 DEG C; (3) respectively sending the absorption liquid into a high temperature polymerization tank and a low temperature polymerization tank to perform primary and secondary polymerization, thereby obtaining the crude product ketene dimer; (4) carrying out vacuum rectification on the crude product ketene dimer to obtain a ketene dimer finished product; and (5) under the action of a combustion-supporting oxidizing gas medium, delivering the rectification residue to a combustion furnace to perform oxidation treatment while controlling the delivery pressure at 6-10 kgf/cm<2>. The technique has the advantages of fewer side reactions, high product yield and no solid waste generation.

Description

technical field [0001] The invention relates to a production process for producing diketene by thermal cracking with acetic acid as raw material. Background technique [0002] Diketene, also known as diketene, is a colorless or light yellow liquid with a strong pungent odor. Because diketene contains two double bonds in its structure and is highly unsaturated, it has high chemical activity and excellent reaction in organic synthesis. It is an important intermediate and acetoacetylating agent in organic synthesis, and is widely used in medicine, pesticides, dyes, food and other industries. [0003] The acetic acid cracking method is a commonly used method to produce diketene. The production process of the acetic acid cracking method is as follows: the acetic acid aqueous solution with a mass concentration of about 92% is heated and vaporized, and then mixed with a phosphate aqueous solution catalyst with a mass concentration of 10% and enters together. The preheating sectio...

Claims

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Application Information

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IPC IPC(8): C07D305/12
CPCC07D305/12
Inventor 沈德智宋为利朱建刘纪才
Owner 南通宏信化工有限公司
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