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Preparation device and method for producing stearic acid in-situ modified calcium hydroxide by dry method digestion process

A calcium hydroxide, in-situ modification technology, applied in chemical instruments and methods, mixing methods, drying gas layout, etc., can solve the problem that the hydrophobic and lipophilic properties of the surface of calcium hydroxide have not been improved, and it is not suitable for industrial production and production technology. Complexity and other problems, to avoid deterioration, narrow particle size distribution, and large activation degree

Inactive Publication Date: 2021-12-10
建德华明科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(3) Dry digestion in-situ modification: when calcium oxide and water undergo dry digestion reaction to generate calcium hydroxide, surface modifiers are used to modify its surface, such as Chinese invention patent application 200910264210.0 using organic amines, multi Hydrophilic substances such as alcohol and sodium carbonate are used as additives. During the process of dry digestion and production of calcium hydroxide, the surface is treated to increase the specific surface area of ​​calcium hydroxide. It is used as a dry desulfurizer. Hydrophilic additives are mainly used to increase the specific surface area of ​​calcium hydroxide, so the hydrophobic and lipophilic properties of calcium hydroxide surface have not been improved
Although the above methods can improve the lipophilicity of calcium hydroxide, the production process is complicated or the cost is high, so it is not suitable for industrialized production

Method used

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  • Preparation device and method for producing stearic acid in-situ modified calcium hydroxide by dry method digestion process
  • Preparation device and method for producing stearic acid in-situ modified calcium hydroxide by dry method digestion process
  • Preparation device and method for producing stearic acid in-situ modified calcium hydroxide by dry method digestion process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A dry digestion process produces stearic acid in-situ modified calcium hydroxide preparation method, comprising the following steps:

[0047] (1) Open the screen digester 10, calcium oxide and stearic acid aqueous solution are synchronously added to the screen digester 10 to carry out the digestion reaction;

[0048] (2) Regulate the flow rate of the stearic acid feed port 46 and the flow rate of the water injection port 56, so that the mass ratio of hot water for digestion and calcium oxide is 0.6:1;

[0049] (3) adjust the flow rate of stearic acid water inlet 23 on the left and right sides so that the temperature of the digested hot water is 80°C;

[0050] (4) Regulate the vibration frequency of the screen cloth 20 so that the mass ratio of stearic acid to calcium oxide is 4:100;

[0051] (5) Open the right stearic acid water inlet 23, adjust the cooling water flow rate, and control the reaction temperature in the digester to be 140°C ± 2°C;

[0052] (6) Regulate t...

Embodiment 2

[0055] A dry digestion process produces stearic acid in-situ modified calcium hydroxide preparation method, comprising the following steps:

[0056] (1) Open the screen digester 10, calcium oxide and stearic acid aqueous solution are synchronously added to the screen digester 10 to carry out the digestion reaction;

[0057] (2) Regulate the flow rate of the stearic acid feed port 46 and the flow rate of the water injection port 56, so that the mass ratio of hot water for digestion and calcium oxide is 0.5:1;

[0058](3) adjust the flow rate of the stearic acid water inlet 23 on the left and right sides so that the temperature of the digested hot water is 70°C;

[0059] (4) adjust the vibration frequency of the screen cloth 20 so that the mass ratio of stearic acid to calcium oxide is 5:100;

[0060] (5) Open the stearic acid water inlet 23 on the right side, adjust the cooling water flow rate, and control the reaction temperature in the digester to be 130°C ± 2°C;

[0061] (...

Embodiment 3

[0064] A dry digestion process produces stearic acid in-situ modified calcium hydroxide preparation method, comprising the following steps:

[0065] (1) Open the screen digester 10, calcium oxide and stearic acid aqueous solution are synchronously added to the screen digester 10 to carry out the digestion reaction;

[0066] (2) Regulate the flow rate of the stearic acid feed port 46 and the flow rate of the water injection port 56, so that the mass ratio of hot water for digestion and calcium oxide is 0.4:1;

[0067] (3) adjust the flow rate of the stearic acid water inlet 23 on the left and right sides so that the temperature of the digested hot water is 75°C;

[0068] (4) Regulate the vibration frequency of the screen cloth 20 so that the mass ratio of stearic acid to calcium oxide is 3:100;

[0069] (5) Open the stearic acid water inlet 23 on the right side, adjust the cooling water flow rate, and control the reaction temperature in the digestion machine to be 120°C ± 2°C;...

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Abstract

The invention relates to the technical field of calcium hydroxide preparation, and discloses a preparation device and method for producing stearic acid in-situ modified calcium hydroxide by a dry method digestion process. The preparation device comprises a sieve mesh digestion machine, a solid-liquid mixing stirrer and a winnowing drying machine, wherein the solid-liquid mixing stirrer comprises a mixer shell and a mixer cover plate, a mixing cavity is formed in the mixer shell, an upward opening is formed in the upper end of the mixer shell, and a stearic acid water discharging opening is formed in the lower end of the mixer shell. In the process of producing calcium hydroxide through dry method digestion of calcium oxide, the stearic acid aqueous solution is synchronously adopted for in-situ modification of calcium oxide, so that calcium hydroxide is effectively prevented from contacting air for a long time and reacting with carbon dioxide in the air to deteriorate; and in the process of producing calcium hydroxide through dry method digestion of calcium oxide, stearic acid is adopted for in-situ modification of calcium hydroxide, so that the surface modification problem of calcium hydroxide is solved at a time, and calcium hydroxide can be directly applied to preparation of calcium hydroxide plastic master batches.

Description

technical field [0001] The invention relates to a preparation device for producing stearic acid in-situ modified calcium hydroxide by a dry digestion process and a preparation method thereof, belonging to the technical field of calcium hydroxide preparation. Background technique [0002] As one of the inorganic powders, calcium hydroxide is generally an inorganic powder produced by digestion of quicklime and water. Due to the wide distribution of raw limestone, simple synthesis process, and relatively low production cost, it is widely used in construction, coatings, food, medicine, and chemical industry. , water treatment, environmental pollution control, etc. However, calcium hydroxide itself is extremely unstable, and it is easy to react with carbon dioxide in the air to form calcium carbonate, and the surface of calcium hydroxide has strong polarity, good hydrophilicity, and poor compatibility with plastic resins. Therefore, if calcium hydroxide is to be better applied t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01F13/10B01F7/18B01F7/16B01F7/08B01F3/22B01F3/20B01F15/06B01J19/18B01J19/20C09C1/02C09C3/08C09C3/04B07B1/28B07B1/42B02C23/24B02C23/08B02C19/00B02C23/16F26B21/00B01F23/70B01F23/80
CPCB01J19/0053B01J19/0066B01J19/20B01J19/18C09C1/02C09C3/08C09C3/041C09C3/006B07B1/28B07B1/42B02C23/24B02C23/08B02C19/00B02C23/16F26B21/001
Inventor 蔡梦军杨永和杨景辉唐捷洪春忠
Owner 建德华明科技有限公司
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