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Thermal cracking process of acetic acid

A technology of pyrolysis and acetic acid, applied in organic chemistry, ketene preparation, etc., to achieve the effect of increasing mixing rate, reducing production cost, and reducing dosage

Inactive Publication Date: 2010-09-01
SUZHOU HOPE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is: a kind of acetic acid pyrolysis process that can make production cost reduce greatly, process step is simple will be provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Stablely add acetic acid into the acetic acid vaporizer at a flow rate of 500L / H. After being vaporized, the acetic acid enters the preheater for preheating. The temperature at the outlet of the preheater is 510 °C. Pressure) with an output pressure of 0.5Mpa and a flow rate of 10L / H, the diammonium phosphate aqueous solution with a mass concentration of 15% is stably sprayed through the nozzle, and the acetic acid vapor and the injected diammonium phosphate solution are mixed in the reaction tube, and the gas and liquid are fully mixed before entering The cracking reaction in the cracking furnace produces ketene and water, etc., and the reaction gas enters the cooling stage for separation and purification. Sampling and analysis at the outlet of the cracking furnace obtained the following data: the conversion rate was 89.8%, and the selectivity was 95.1%. The data obtained by using triethyl phosphate as a catalyst and liquid ammonia as a polymerization inhibitor to prep...

Embodiment 2

[0018] Stablely add acetic acid into the acetic acid vaporizer at a flow rate of 500L / H. After being vaporized, the acetic acid enters the preheater for preheating. The temperature at the outlet of the preheater is 500°C. Pressure) with an output pressure of 0.5Mpa and a flow rate of 10L / H, the aqueous solution of 10% monoammonium phosphate is stably sprayed through the nozzle, the acetic acid vapor and the injected monoammonium phosphate solution are mixed in the reaction tube, and the gas and liquid are fully mixed before entering The cracking reaction in the cracking furnace produces ketene and water, etc., and the reaction gas enters the cooling stage for separation and purification. Sampling and analysis at the outlet of the cracking furnace obtained the following data: the conversion rate was 87.2%, and the selectivity was 95.7%. The data obtained by using triethyl phosphate as a catalyst and liquid ammonia as a polymerization inhibitor to prepare ketene under the same c...

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Abstract

The invention discloses a thermal cracking process of acetic acid, which comprises the following steps of: vaporizing the acetic acid, and then, enabling the acetic acid to enter a preheating furnace; dissolving a catalyst into a solvent to form a solution before the acetic acid enters the preheating furnace; adding the catalyst solution into acetic acid gas; and mixing the acetic acid gas and the catalyst solution, and then, enabling the mixture to enter a cracking furnace for cracking, wherein the catalyst is ammonium phosphate salt. The process has simple working procedure and low cost and is convenient for being widely used industrially.

Description

technical field [0001] The invention relates to an acetic acid pyrolysis process. Background technique [0002] Using acetic acid as a raw material and triethyl phosphate as a catalyst to produce ketene, diketene, acetic anhydride, and its derivatives of ketene through thermal cracking is currently widely used at home and abroad. This method is mature and the catalyst is easy to disperse And better reactivity. Taking the production of ketene as an example, the process method is as follows: acetic acid enters the preheating furnace after being vaporized, and before entering the preheating furnace, the solution of catalyst triethyl phosphate is added to the acetic acid gas by dripping or jetting, and the acetic acid gas After mixing with triethyl phosphate solution, it enters the cracking furnace for cracking. The cracking products are ketene, water and a small amount of carbon monoxide, carbon dioxide, ethylene, acetylene, etc. Since the thermal cracking reaction of acetic a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C49/90C07C45/89
Inventor 沈德智仇从光王正龙包忠祥刘纪才陈小萍
Owner SUZHOU HOPE TECH
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