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Process for producing calcium stearate by one-step aqueous phase method

A technology of calcium stearate and stearic acid, which is applied in the direction of carboxylate preparation, carboxylate preparation, chemical instruments and methods, etc., can solve the problems of small bulk density, large bulk density, and coarse particles, and reach the reaction temperature Low, high reaction efficiency, fine particle effect

Inactive Publication Date: 2020-04-03
HANGZHOU OIL & FAT CHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process has the advantage of sufficient reaction of the double decomposition method, but the product particles are relatively thick and the bulk density is high, which often cannot meet the needs of users for products with low bulk density.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Add 5000kg of water, 0.35kg of composite surfactant (AES:AOS:CAB=2:2:1) and 250kg of calcium hydroxide in the reactor, heat up to 45°C, stir for 5min, add 1700kg of stearic acid (feeding time is 30min), the temperature was raised to 58°C, and the reaction was stirred for 2 hours. After the reaction is completed, the product is filtered and dried to obtain the finished product. The quality test results of the product are shown in Table 1.

Embodiment 2

[0020] Add 5000kg of water, 0.4kg of composite surfactant (AES:LAS:CAB=2:2:1) to the reactor, 220kg of calcium hydroxide, heat up to 45°C, stir for 5min, add 1500kg of stearic acid (feeding time is 30min), the temperature was raised to 58°C, and the reaction was stirred for 1.5 hours. After the reaction is completed, the product is filtered and dried to obtain the finished product. The quality test results of the product are shown in Table 1.

Embodiment 3

[0022] Add 5000kg of water, 0.4kg of composite surfactant (AES:LAS=1:1), 220kg of calcium hydroxide into the reaction kettle, heat up to 45°C, stir for 5min, add 1500kg of stearic acid (feeding time is 30min), and heat up To 58°C, the reaction was stirred for 1.5 hours. After the reaction is completed, the product is filtered and dried to obtain the finished product. The quality test results of the product are shown in Table 1.

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Abstract

The invention relates to a heat stabilizer. The invention aims to provide a process for producing calcium stearate by using a one-step aqueous phase method. According to the process, a product with the quality index equivalent to that of double decomposition process can be produced, wastewater discharge is reduced compared with the double decomposition process, and production energy consumption isreduced. The technical scheme is as follows: the process for producing calcium stearate by the one-step aqueous phase method comprises the following steps: 1) adding calcium hydroxide, water and a surfactant into a reaction kettle, starting stirring, and heating to 43-50 DEG C; 2) stirring for 5 min, adding stearic acid, and controlling the feeding time of stearic acid to be within 30-40 min, 3)starting steam heating, raising the temperature to 58-60 DEG C, closing a steam valve, and continuously and circularly stirring for 2-3 h, and 4) filtering, drying and packaging to obtain a calcium stearate product.

Description

technical field [0001] The invention relates to a heat stabilizer, in particular to a method for synthesizing calcium stearate in one step from stearic acid. Background technique [0002] Calcium stearate is a typical representative of stearate. It is mainly used in soft and hard products such as food packaging films, transparent sheets, and medical equipment. It is an indispensable non-toxic heat-stable product in the process of PVC processing. agent. At present, the synthesis methods of calcium stearate mainly include: double decomposition method, one-step aqueous phase method and melting method. The metathesis process is the most mature, 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 undergoes a metathesis reaction with a pre-configured water-soluble calcium salt to form stearin Calcium acid and water-soluble sodium salt. The products produced by this process h...

Claims

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Application Information

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IPC IPC(8): C07C51/41C07C53/126
CPCC07C51/412C07C53/126
Inventor 郭霞王文德张军城史立文葛赞芮兴良方银军
Owner HANGZHOU OIL & FAT CHEM
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