Synthetic method for preparing ketene by dehydrating acetic acid

A synthesis method and a technology for dehydration of acetic acid, applied in the chemical industry, can solve the problems of low selectivity and ketene yield of only 85%, and achieve the effect of reducing energy consumption

Active Publication Date: 2014-02-12
NANTONG ACETIC ACID CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the production of ketene by conventional technology, the conversion rate of aceti...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Take 225.3g ethyl orthosilicate, add 80.6g water, 5.6g ethanol, and hydrolyze at 35-40°C to get solution A; take 35g tungstophosphoric acid, dissolve it in 10g ethanol to get solution B, pour solution B into solution A , react at 82-88°C for 4-6 hours, then vacuum-dry the hydrogel at 40-45°C, and finally dry the dry gel at 140-160°C overnight to obtain 100g of silica tungstophosphoric acid containing 35% tungstophosphoric acid .

[0016] Example 2:

Embodiment 2

[0018] Example 3:

Embodiment 3

[0020] Example 4:

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PUM

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Abstract

The invention relates to a synthetic method for preparing ketene by dehydrating acetic acid. The method comprises the following specific steps: after being mixed by the mass ratio of 1: 0.03-0.001, acetic acid and an polymerization inhibitor are vaporized at 120-140 DEG C in an acetic acid evaporator, introduced to a fixed bed reactor after being pre-heated to be at 300-400 DEG C, and contacted with a catalyst to be subjected to a dehydration reaction for 3-10 seconds at 650-700 DEG C to generate ketene gas; after being cooled by 110-160 DEG C by a heat exchanger, the ketene gas is cooled and recycled by a brine cooler to obtain a ketene finished product. The synthetic method has the benefits of greatly improving the conversion rate and selectivity of the acetic acid as well as the yield of the ketene product, reducing the reaction temperature and the energy consumption, recycling heat energy and achieving the purposes of energy conservation and consumption reduction.

Description

technical field [0001] The invention relates to a method for preparing basic raw materials of fine chemical dyes, medicines, pesticides, food and feed additives, auxiliary agents, etc. in the chemical industry, and specifically relates to a synthesis process for preparing vinyl ketone by dehydration of acetic acid. Background technique [0002] Ketene is an irritating, toxic, colorless gas, slightly soluble in water, and soluble in many organic solvents. [0003] Vinyl ketone is mainly used in the synthesis of chemical basic raw materials and reagents, and is the main raw material for the production of food preservative sorbic acid; vinyl ketone is very unstable and difficult to store, and it is easy to form dimer diketene. Diketene is a fine chemical dye, medicine, pesticide , food and feed additives, additives and other raw materials. [0004] At present, the typical production method in industrial production is: acetic acid is cracked in a high-temperature cracking furna...

Claims

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Application Information

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IPC IPC(8): C07C49/90C07C45/89
CPCC07C45/89C07C49/90
Inventor 丁彩峰朱小刚刘芳姚俊生
Owner NANTONG ACETIC ACID CHEM
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