Method for producing low-phosphor dimer acid

A production method and technology of dimer acid, applied in chemical instruments and methods, separation/purification of carboxylic acid compounds, preparation of carboxylate, etc., can solve problems affecting the quality of dimer acid and affecting the application of dimer acid, and achieve Continuous and rapid separation, eliminating hidden dangers and improving quality

Active Publication Date: 2009-07-29
YIHAI TIANCHENG LIANYUNGANG CHEM INDSCO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, solid impurities such as excessive phosphoric acid and a small amount of diafiltered phosphate affect the quality of dimer acid, which has become a major defect of dimer acid in the current market and greatly affects the application of dimer acid.

Method used

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  • Method for producing low-phosphor dimer acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Put 360Kg oleic acid, 60Kg activated clay, and 1.3Kg lithium carbonate into 0.6M 3 In the reaction kettle, stir at a constant speed and heat up to 250°C, keep it warm for 6 hours, after the heat preservation is completed, cool down to 100°C, add 7Kg of phosphoric acid and 6Kg of water, then heat up to 150°C for 2.5 hours, cool to 120°C and press filter to obtain the crude polymeric acid The viscosity is 1150cp / 25°C.

[0022] The polymeric acid after pressure filtration is transported to the washing tank, and water is added according to the acid:water (w / w) ratio of 2:1, and the stirring is started, and the washing temperature is controlled at 50°C for 30 minutes, and then the mixed emulsion is sent to the centrifugal separation device Separate and dehydrate.

[0023] The polymeric acid after washing and dehydration is pumped to the distillation system, and the dimer acid and monomeric acid are separated through dehydration, flash evaporation, molecular distillation and...

Embodiment 2

[0025] Put 360Kg oleic acid, 60Kg activated clay, and 1.3Kg lithium carbonate into 0.6M 3 In the reaction kettle, stir at a constant speed and heat up to 250°C, keep it warm for 6 hours, after the heat preservation is completed, cool down to 100°C, add 7Kg of phosphoric acid and 6Kg of water, then heat up to 150°C for 2.5 hours, cool to 120°C and press filter to obtain the crude polymeric acid The viscosity is 1040cp / 25°C.

[0026] The polymeric acid after pressure filtration is sent to the washing tank. Add in acid:water (w / w) ratio of 5:3, start stirring, control the washing temperature to 50°C for 30 minutes, and then send the mixed emulsion to a centrifugal separation device for separation and dehydration.

[0027] The polymeric acid after washing and dehydration is pumped to the distillation system, and the dimer acid and monomeric acid are separated through dehydration, flash evaporation, molecular distillation and other processes. The viscosity of the finished dimer a...

Embodiment 3

[0029] Put 360Kg oleic acid, 60Kg activated clay, and 1.3Kg lithium carbonate into 0.6M 3 In the reaction kettle, stir at a constant speed and heat up to 250°C, keep it warm for 6 hours, after the heat preservation is completed, cool down to 100°C, add 7Kg of phosphoric acid and 6Kg of water, then heat up to 150°C for 2.5 hours, cool to 120°C and press filter to obtain the crude polymeric acid The viscosity is 1040cp / 25°C.

[0030] The polymeric acid after pressure filtration is sent to the washing tank. Add water according to the acid:water (w / w) ratio of 3:1, start stirring, control the washing temperature at 60°C for 60 minutes, and then send the mixed emulsion to a centrifugal separation device for separation and dehydration.

[0031] The polymeric acid after washing and dehydration is pumped to the distillation system, and the dimer acid and monomeric acid are separated through dehydration, flash evaporation, molecular distillation and other processes. The viscosity of ...

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Abstract

The invention relates to a method for producing low-phosphorous dimer acid and provides a method for producing dimer acid with low phosphor content. The method is characterized in that oleic acid is polymerized by catalysts of carclazyte, phosphoric acid and the like to obtain crude polymerized acid; the crude polymerized acid is washed by water; a centrifugal separation device is used for separating the polymerized acid from the water continuously to remove excessive phosphate and other filtered solid impurity to obtain low-phosphorous polymerized acid. The washing condition is as follows: the proportion of the polymerized acid and water (W/W) is 1: 0.1-10; the washing temperature is 10 DEG C to 100 DEG C; and the washing time is 0.1h to 3h. Molecular distillation is carried out on the low-phosphorous polymerized acid to obtain the low-phosphorous dimer acid and a side product of monomer acid. The invention increases the working procedures of washing and separating, thereby ensuring that the content of the phosphate of the dimer acid is reduced to be lower than 30mu g/g, reducing the content of the impurity in the dimer acid and improving the quality of the dimer acid and the downstream product.

Description

technical field [0001] The invention relates to a production method of low phosphorus dimer acid. More specifically, various vegetable oleic acids are used as raw materials, and the crude polymeric acid is obtained by catalytic polymerization and filtration. After washing with water, the low-phosphorus polymeric acid is obtained by continuous and efficient dehydration and separation by a centrifugal separation device, and finally the low-phosphorus polymeric acid is prepared by molecular distillation. Phosphodimer acid. Background technique [0002] Dimer acid is yellow or yellow-brown transparent viscous liquid. It is a dicarboxylic acid formed by catalytic polymerization of unsaturated fatty acids in natural oils and fats. It has excellent physical and chemical properties. It is the basic raw material for many fine chemical products and an important organic synthesis intermediate. The development and utilization prospects of coatings, plastics, inks, adhesives, lubricant...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/347C07C51/42C07C55/02
Inventor 黄荣来黄荣模黄清华吴国亮刘春辉
Owner YIHAI TIANCHENG LIANYUNGANG CHEM INDSCO
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