Method for producing stearoyl chloride and homologs thereof by liquid-phase phosgenation

A technology of stearoyl chloride and phosgenation, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve problems such as difficult absorption, low reaction intensity, slow reaction speed, etc., to improve reaction driving force, The effect of improving the update speed and reducing the response time

Inactive Publication Date: 2012-08-15
甘肃银光聚银化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above-mentioned reaction is an exothermic reaction. Most industrial production adopts normal pressure, straight-through, gas-liquid two-phase reaction process. Due to the limited reaction gas-liquid contact surface, the reaction process is long and the reaction intensity is low, resulting in slow reaction speed and long reaction time. Long (about 4 to 8 hours), and some materials have more over-reaction phenomena; due to the straight-through reaction, the phosgene conversion rate (utilization rate) is low, and the purity of the acid chloride product cannot meet the requirements; By-products of HCl and CO 2 Difficult to absorb, serious environmental pollution

Method used

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  • Method for producing stearoyl chloride and homologs thereof by liquid-phase phosgenation
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  • Method for producing stearoyl chloride and homologs thereof by liquid-phase phosgenation

Examples

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Effect test

Embodiment 1

[0036] Example 1, see figure 1 , a method for producing stearyl chloride and its homologues by liquid-phase phosgenation, characterized in that: continuous operation, raw material A, catalyzer, phosgene are added to the main photochemical reactor 5 at the same time, through the main photochemical reaction Kettle 5, photochemical reaction maturation kettle 6 reaction and negative pressure dephosphorization tower 7 dephosphorization, stearoyl chloride product decolorization device 8 decolorizes and continuously produces stearoyl chloride products, and the raw material A is stearic acid or its homologue One or two to three mixtures of its homologues, the specific steps are as follows:

[0037] a, the raw material A in the raw material A storage tank 1 is added to the main photochemical reaction kettle 5 through the delivery pump 2, and at the same time, the liquid phase phosgene in the liquid phosgene storage tank 3 is added to the main photochemical reaction kettle 5 through the...

Embodiment 2

[0053] Example 2, see figure 1 , step is with embodiment 1, and concrete process parameter is:

[0054] φ450 mm stirring main photochemical reactor, reactor height 650 mm, stirrer speed 450 rpm; φ300 mm stirred photochemical reaction maturation tank, reactor height 450 mm, stirrer speed 350 rpm. The amount of molten stearic acid added is: 45 kg / hour, the amount of dimethylformamide added is 0.6 kg / hour, and the amount of phosgene added is 18 kg / hour, which is continuously added to the reactor for reaction, and the temperature of the reactor is controlled 90~95℃, the reaction pressure is controlled at 0.8-1.0MPa, the temperature of the tank top condenser is controlled at 8-12℃, the non-condensable tail gas of the tank top condenser passes through the phosgene rectification tower and the HCl absorption tower, and then enters the alkali liquid destruction tower for destruction treatment ; Negative pressure dephosphorization tower control temperature 80-110 ℃, negative pressure c...

Embodiment 3

[0055] Example 3, see figure 1 :

[0056] φ450 mm stirring main photochemical reactor, reactor height 650 mm, stirrer speed 450 rpm; φ300 mm stirred photochemical reaction maturation tank, reactor height 450 mm, stirrer speed 350 rpm. Molten state stearic acid, palmitic acid mixture (stearic acid 35%, palmitic acid 65%) charging amount is: 50 kilograms / hour, strongly acidic cationic resin dimethylformamide adsorption solidified product adding amount is 3.8 kg, the amount of phosgene added is 23 kg / hour, and it is continuously added to the reactor for reaction. The non-condensable tail gas of the top condenser passes through the phosgene rectification tower and the HCl absorption tower, and then enters the lye destruction tower for destruction; the negative pressure dephosphorization tower controls the temperature at 70-90°C, and the negative pressure is controlled at 8KPa(a), and then goes through the decolorization bed. After 3 hours of stable reaction and feeding, start sa...

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Abstract

The invention relates to a method for producing stearoyl chloride and homologs thereof by liquid-phase phosgenation, which is characterized in continuous operation. The method comprises the following steps: simultaneously adding a raw material A, a catalyst and phosgene into a main photochemical reaction kettle (5), reacting in the main photochemical reaction kettle (5) and a photochemical reaction mature kettle (6), removing the phosgene by a negative pressure phosgene removal column (7), and decolorizing by a stearoyl chloride product decolorizing device (8) to continuously generate the stearoyl chloride product, wherein the raw material A is one of stearic acid and homologs thereof, or the mixture of two or three of the homologs. The invention solves the problems of long reaction time, low phosgene utilization ratio, multiple byproducts, low product purity, difficulty in absorbing and utilizing the generated HCl and CO2 gases, and the like in the existing technique for producing stearoyl chloride by gas-phase phosgenation, and provides a high-efficiency environment-friendly high-quality production technique of stearoyl chloride, homologs and homologic mixtures thereof.

Description

technical field [0001] The invention relates to a process production method for producing stearoyl chloride and its homologues by liquid-phase phosgenation (acylation). Background technique [0002] Stearoyl chloride, palmitoyl chloride, mixture of hard / palmitoyl chloride and their homologues, is a kind of important organic chemical raw material, which is produced by linear carboxylic acid chloride, and is mainly used as a sizing agent for paper pulp. The synthesis of polymers (AKD) is also widely used in the synthesis of medicines, dyes, surfactants, etc. In recent years, with the application and promotion of stearoyl chloride and its homologue downstream products, the market demand has grown steadily. my country is a big producer of papermaking and daily chemicals, and the market prospect of stearoyl chloride and its homologues is extremely broad. [0003] The production process of industrialized stearoyl chloride and its homologues is mainly based on the gas phase phosg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C53/42C07C51/60
Inventor 沈精平李晓明蒙鸿飞李莉腾志君张义新孟柱陈光
Owner 甘肃银光聚银化工有限公司
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