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Preparation method for one-step synthesis of barium stearate by stearic acid

A technology of barium stearate and stearic acid, which is applied in the field of preparation of one-step synthesis of barium stearate, can solve the problems of large heat loss, difficult to handle, and high water consumption, and achieve low environmental pollution, heat saving, and simplified process Effect

Inactive Publication Date: 2012-03-14
NANTONG XINBANG CHEM
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0003] At present, the main method of producing barium stearate products in China is saponification metathesis method. It is understood that more than 80% of stearate manufacturers do not perform washing operation, which will cause barium stearate to contain soluble salts and saponification of barium stearate. The double decomposition process has a lot of water consumption, and the high concentration of inorganic salts in the wastewater is difficult to deal with. The temperature of the discharged wastewater is about 40-80°C, and the heat loss is very large.
[0004] Another method is to add stearic acid, water, and barium chloride first, and then add sodium hydroxide to the saponification method. The disadvantage is the same as that of the saponification metathesis method, and the product is not as fluffy as the saponification metathesis method.
[0005] There is no patent report on barium stearate in China

Method used

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Examples

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Effect test

preparation example Construction

[0012] The preparation method of stearic acid one-step synthetic barium stearate comprises the following steps:

[0013] 1. Add barium hydroxide into water, heat and stir to dissolve at about 60-80°C, filter while hot to remove barium carbonate in the barium hydroxide, and obtain a high-purity barium hydroxide aqueous solution at about 60-80°C for future use.

[0014] 2. Stearic acid is added into water, heated and stirred until the stearic acid melts, and ammonia water with a concentration of 2% to 30% is added as a catalyst for emulsification pre-reaction.

[0015] 3. Add the pre-refined barium hydroxide solution into the pre-reaction material in step 2 under stirring, until the reaction system becomes thick as a whole, take a sample and observe that the dropped droplet is transparent as the reaction end point. The reaction was continued for about 15 minutes.

[0016] 4. The above materials are subjected to centrifugal dehydration or press filter dehydration.

[0017] 5. T...

Embodiment 1

[0031] Heat and stir 30g barium hydroxide octahydrate and 250ml water to 60-80°C, filter while hot to remove the barium carbonate in the barium hydroxide, ensure the purity of the barium hydroxide is above 98%, and control the temperature at 60-80°C for later use . 50g of first-grade stearic acid, 250ml of water are stirred and heated to after stearic acid is melted, and then adding concentration is 25% strong ammonia water 20 drops (1ml in total) at 60 ℃, and reactant is milky white homogeneous emulsion (viscosity is very high) in half a minute. Small), add the above-mentioned barium hydroxide solution, the material thickens rapidly and has no viscosity. Continue to stir for 15 minutes, finish the reaction suction filtration, the filtrate water is clear and the filtrate composition is water and ammoniacal liquor, and the obtained damp barium stearate is dried, after drying, detect barium content 20.60%, free acid 0.10%, about 350ml of filtrate.

Embodiment 2

[0033] 29.8g barium hydroxide octahydrate, water 150ml, filtrate 100ml of example 1 are heated and stirred to 60~80 ℃, filter while hot to remove the barium carbonate in the barium hydroxide, and the barium hydroxide aqueous solution of about 60~80 ℃ is standby. 50g of first-grade stearic acid, 250ml of the filtrate of Example 1, stirring and heating to about 60°C, after adding 0.75ml of concentrated ammonia water with a concentration of 25%, the reactant was a milky white uniform emulsion, and the prepared barium hydroxide aqueous solution was added to thicken rapidly without stickiness . Continue to stir for 15 minutes, complete the reaction and suction filtration, the suction filtration speed is very fast, and the filtrate is clear. After drying, the barium content was detected to be 19.52%, the free acid was 0.20%, and the filtrate was about 350ml.

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Abstract

The present invention discloses a preparation method for one-step synthesis of barium stearate by stearic acid. According to the present invention, under normal pressure, stearic acid, ammonia (adopted as a catalyst) and a barium hydroxide hydrothermal solution are subjected to a heating reaction in an aqueous medium to obtain a barium stearate wet material; the resulting barium stearate wet material is subjected to centrifugal dewatering or pressure filtration dewatering, and then is subjected to rotary flash drying or pneumatic drying to obtain the barium stearate. According to the present invention, no inorganic salt requiring discharge is introduced in the aqueous medium, all the circulating water can be recycled unlimited, and no waste water is discharged; the preparation method of the present invention has low environmental pollution, the tiny volatile ammonia generated during the preparation process meets the environmental protection emission standard; with the method of the present invention, the production equipment used in the conventional double decomposition method can be adopted, the barium stearate (lightweight) product can be produced, wherein the appearance of the barium stearate (lightweight) product is basally consistent with the appearance of the product produced by the double decomposition method, the quality of the barium stearate (lightweight) product is higher than the quality of the product produced by the double decomposition method, the water consumption and the energy consumption of the method of the present invention are significantly reduced, the quality of the product produced by the method of the present invention is significantly improved; the method of the present invention is worth to popularize in the stearate industry.

Description

Technical field: [0001] The invention belongs to the technical field of metal soap preparation, and in particular relates to a preparation method for one-step synthesis of barium stearate with stearic acid and barium hydroxide aqueous solution under the action of a catalyst. Background technique: [0002] Barium Stearate Uses: This product is thermally stable of polyethylene and vinyl chloride copolymer, has excellent lubricity, and good long-term heat resistance. Mainly used in polyvinyl chloride products such as transparent film, sheet, artificial leather, hard board and pipe. [0003] At present, the main method of producing barium stearate products in China is saponification metathesis method. It is understood that more than 80% of stearate manufacturers do not perform washing operation, which will cause barium stearate to contain soluble salts and saponification of barium stearate. The double decomposition process has a lot of water consumption, and the high concentrat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C53/126C07C51/41
Inventor 鲍兴来冒圣华冒莹莹
Owner NANTONG XINBANG CHEM
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