Calcium stearate production method

A calcium stearate and production method technology, applied in carboxylate preparation, organic chemistry, etc., can solve the problems of high equipment requirements, high equipment requirements, high energy consumption, etc., achieve low equipment requirements, obvious economic benefits, The effect of low reaction temperature

Inactive Publication Date: 2013-01-16
NANTONG XINBANG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the domestic production of calcium stearate is mainly based on the double decomposition method, that is, stearic acid reacts with sodium hydroxide solution in the water phase to form a sodium stearate soap solution, and the sodium stearate soap solution is combined with a pre-prepared water-soluble calcium salt. reaction to generate calcium stearate and water-soluble sodium salts, the hot water containing water-soluble inorganic salts produced during the production process cannot be recycled, and thus, a large amount of waste water containing inorganic salts can only be discharged (if the inorganic salts are recovered, it can be Consumption is too high, no economic value)
[0003] Stearic acid and calcium hydroxide are mixed evenly in the water phase at low temperature and heated slowly, and the heavy product with coarse particles is obtained from the reaction, which is easy to form a package and the reaction is not complete. Additional crushing eq

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Ammonium stearate is used as a catalyst, and no circulating filtrate is applied mechanically.

[0032] at 1 m 3 Add 450 kg of water to the batching kettle, and heat it to 60°C~95°C, then add 76 kg of calcium hydroxide (calcium hydroxide content above 98%), stir for 10 minutes, pass through a 200-mesh stainless steel sieve, and filter the calcium hydroxide The suspension is sent to the calcium hydroxide high tank with stirring.

[0033] at 5m 3 Add 3550 kg of water to the reaction kettle, then add 456.6 kg of stearic acid, heat to 58~62 ° C, the stearic acid melts, under stirring conditions, add 46 kg of catalyst ammonium stearate, stir evenly, slowly add and filter For the final calcium hydroxide suspension, the reaction temperature is controlled to be no more than 85°C, and the final pH is 9 to 9.5 to obtain the intermediate calcium stearate slurry of calcium stearate, and continue to stir for 15 minutes to make the reaction more complete and hard. The calcium s...

Embodiment 2

[0035] Ammonium stearate is used as a catalyst, and the circulating filtrate is applied mechanically.

[0036] at 1 m 3 Add 450 kg of circulating filtrate to the batching kettle, and heat it to 60°C~95°C, then add 73 kg of calcium hydroxide (calcium hydroxide content above 98%), stir for 10 minutes, pass through a 200-mesh stainless steel sieve, and the filtered hydroxide The calcium suspension is sent to the high level tank of calcium hydroxide with stirring.

[0037] at 5m 3 Add 3550 kilograms of remaining filtrate and supplementary water in the reaction kettle of Example 1, add 456.6 kilograms of stearic acid again, be heated to 58 ~ 62 ℃, stearic acid melts, under stirring, add 46 kilograms of catalyst ammonium stearate , stir evenly, slowly add the calcium hydroxide suspension after filtration, control the reaction temperature not to exceed 85°C, and the final pH is 9 to 9.5 to obtain the intermediate calcium stearate slurry of calcium stearate, and continue to stir for...

Embodiment 3

[0039] In the reaction process, the ammonium stearate generated by the reaction of ammonia and stearic acid acts as a catalyst, and there is no circulating filtrate to apply mechanically.

[0040] at 1 m 3 Add 450 kg of water to the batching kettle, and heat it to 60°C~95°C, then add 76 kg of calcium hydroxide (calcium hydroxide content above 98%), stir for 10 minutes, pass through a 200-mesh stainless steel sieve, and filter the calcium hydroxide The suspension is sent to the calcium hydroxide high tank with stirring.

[0041] at 5m 3 Add 3550 kg of water to the reaction kettle, then add 500 kg of stearic acid, heat to 58~62°C, melt the stearic acid, add 10 kg of ammonia water under stirring, ammonia water and stearic acid form catalyst ammonium stearate, Ammonium stearate is both a catalyst and a surfactant. Disperse stearic acid evenly in water, stir for 5 minutes, slowly add filtered calcium hydroxide suspension, control the reaction temperature not to exceed 85°C, and t...

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PUM

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Abstract

The invention discloses a calcium stearate production method. The calcium stearate production method is characterized by including steps of firstly, subjecting ammonium stearate and calcium hydroxide to reaction to generate calcium stearate and ammonia water; secondly, when calcium hydroxide turbid liquid is insufficiently added, stearic acid is excessive, subjecting the stearic acid and the ammonia water to reaction to generate the ammonium stearate, and preparing the ammonium stearate required in the first step; and when calcium hydroxide turbid liquid is slightly excessively added, subjecting the ammonium stearate and the calcium hydroxide to reaction and generating calcium stearate and ammonia water, wherein the ammonia water is freed and is decomposed to generate ammonia gas on the condition of the pH (potential of hydrogen) value of 9-9.5 of the reaction system at the temperature of 65-85 DEG C, and filtrate is composed of water and precious little calcium hydroxide soluble in water. The calcium stearate production method is simple in process and is low in reaction temperature and energy consumption and low in requirements for equipment as compared with a double decomposition process, no reflux reaction is needed in the later stage of reaction, even general double decomposition process production equipment can produce products, economic benefits are evident, and accordingly, the calcium stearate production method is applicable to further popularization.

Description

technical field [0001] The invention belongs to the technical preparation field of heat stabilizers, and in particular relates to a new process for synthesizing aqueous phase calcium stearate. Background technique [0002] Calcium stearate is a non-toxic heat stabilizer for polyvinyl chloride and an indispensable processing aid in the processing of polyvinyl chloride resin plastics. At present, the domestic production of calcium stearate is mainly based on the double decomposition method, that is, stearic acid reacts with sodium hydroxide solution in the water phase to form a sodium stearate soap solution, and the sodium stearate soap solution is combined with a pre-prepared water-soluble calcium salt. reaction to generate calcium stearate and water-soluble sodium salts, the hot water containing water-soluble inorganic salts produced during the production process cannot be recycled, and thus, a large amount of waste water containing inorganic salts can only be discharged (if...

Claims

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Application Information

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IPC IPC(8): C07C53/126C07C51/41
Inventor 冒圣华周松涛冒莹莹
Owner NANTONG XINBANG CHEM
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