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Clean production method for dioctyl phthalate

A technology for clean production of dioctyl phthalate, applied in the field of clean production of dioctyl phthalate, can solve the problems of high material consumption and energy consumption, long production process, large investment in equipment, etc., and achieve pollutant discharge Less water consumption, lower water consumption, and higher product quality

Inactive Publication Date: 2006-12-27
TIANJIN TIANRONG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are two kinds of processes: continuous method and batch method. At present, the domestic continuous method is represented by two sets of 50,000 tons / year continuous production equipment imported from Germany. It adopts the esterification method of 5 kettles in series, equipped with continuous neutralization and water washing. , dealcoholization, filtration and other post-processing processes to obtain finished products, the production process is long, the equipment investment is large, and the material consumption and energy consumption are high

Method used

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  • Clean production method for dioctyl phthalate

Examples

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Embodiment 1

[0021] As shown in the process flow diagram of the present invention shown in Figure 1, 1000g of phthalic anhydride and 3000g of octanol are used as raw materials in a percentage by weight of 1: 2 to 3, and tetraisopropyl titanate is used as a catalyst, and the addition amount is 6g of the total material. In the reaction kettle 1, the esterification reaction is carried out by heating under normal pressure. The excess octanol and the water generated by the esterification reaction form an alcohol-water azeotrope, which is separated by the esterification tower 2, and part of the alcohol is returned to the reaction kettle. After the esterification condenser 3 is condensed and cooled, it is collected into the phase separator 4, and after settling and separation, the alcohol is returned to the esterification tower, and the reaction end point temperature is 220°C for complete reaction; Steam deoctanol, this process can remove 60% excess octanol in the esterification reaction, collect ...

Embodiment 2

[0023] Same as Example 1, except: 1,500 g of phthalic anhydride, 2,000 g of octanol and 1,000 g of recovered alcohol were used as raw materials, tetraisopropyl titanate was used as a catalyst, the addition amount was 28 g of the total material, and the reaction end point temperature was 230° C. for complete reaction; During the esterification reaction, 70% of excess octanol was removed, and the temperature in the kettle dropped to 180° C. after flash evaporation.

Embodiment 3

[0025] Same as Example 1, the difference is: 1000g of phthalic anhydride and 2500g of octanol as raw materials, using tetraisopropyl titanate as catalyst, the addition amount is 18g of the total material, and the reaction terminal temperature is 240°C for complete reaction; 80 % excess octanol is released, and the temperature in the kettle drops to 190° C. after flashing.

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Abstract

The invention discloses a cleaning manufacturing method of phthalic acid dioctyl, which is characterized by the following: setting esterification and dealcoholization within one equipment; adopting benzoic anhydride and octanol as raw material at 1:2-3 weight percentage; utilizing titanic hydroxide four propyl ester as catalyst; setting addictive quantity at 0.0015%-0.005% in the total material; generating coarse ester in the autoclave under normal pressure; controlling reacting final temperature at 220-240 deg.c; flashing octanol through residual heat in the autoclave; dehydrating excess 60-80% octanol in the esterifying reaction; collecting sedimenting water after condensing; cooling temperature in the autoclave at 170-190 deg.c; inputting water at this temperature; distilling steam in the autoclave; removing residual octanol.

Description

technical field [0001] The invention belongs to the technical field of organic chemical industry, in particular to a clean production method of dioctyl phthalate. Background technique [0002] Dioctyl phthalate is a main plasticizer with better performance, because it has better compatibility, lower volatility, lower extractability, better low temperature flexibility and good electrical properties and resistance to heat and light. Therefore, in addition to being widely used in PVC sheet, film, artificial leather, nitrocellulose, and synthetic rubber industries, it is also used in cable particle manufacturing, medical equipment, etc. [0003] At present, there are several processes for producing dioctyl phthalate in foreign countries: acid catalyst production process, non-acid catalyst production process and catalyst-free process. There are continuous method, semi-continuous method and batch method in the unit production mode. At present, The...

Claims

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Application Information

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IPC IPC(8): C07C67/08C07C69/80
Inventor 王秋莲冯祥立李彪王宏
Owner TIANJIN TIANRONG CHEM
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