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A kind of active calcium phosphate production method capable of continuous operation

A technology of activated calcium phosphate and its production method, which is applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve problems such as low labor efficiency, low activity, and difficulty in controlling product particle size, and achieve the effect of controllable particle size

Active Publication Date: 2016-03-09
LIANYUNGANG SHUREN KECHUANG FOOD ADDITIVE
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Problems solved by technology

[0017] Most of the above traditional processes adopt intermittent production methods, which have high labor intensity and low labor efficiency. The particle size of the product is difficult to control, the product quality is unstable, and the activity is low.

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  • A kind of active calcium phosphate production method capable of continuous operation

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Embodiment Construction

[0027] A method for continuously operating active calcium phosphate production, comprising the following production steps, (1) preparation of raw materials: Ca(OH) with a mass percentage content greater than or equal to 98% 2 Add water and mix according to the ratio of 0.7-0.8:1, and prepare Ca(OH) with a concentration of 40%-45%. 2 Slurry; (2) Reaction: adopt the tubular reactor 1 with stirring to carry out continuous production, and the above-mentioned Ca(OH) 2 Slurry and phosphoric acid with a concentration of 65% are continuously and uninterruptedly added to the inside of tubular reactor 1 in a ratio of 1.8:1 by mass ratio, and the feed flow rate is adjusted so that Ca(OH) 2The residence time of the slurry and phosphoric acid in the tubular reactor is controlled between 15 and 20 minutes. At the same time, the reaction temperature in the tubular reactor 1 is controlled to be 50°C-60°C, the pressure is 1-2MP, and the pH is 7 ~8, and the neutralization reaction is carried o...

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Abstract

The invention discloses a continuously operable active calcium phosphate production method, which comprises the following steps: (1) preparation of raw materials; (2) reacting; (3) spray drying; and (4) packaging of finished products. According to the production method disclosed by the invention, Ca(OH)2 slurry with a concentration of 40-45% and a phosphoric acid with a concentration of 65% are continuously added into a tubular reactor in a mass ratio of 1.8 to 1, the synthesis and particle size of calcium phosphate are controlled by controlling the residence time of the obtained mixture in the tubular reactor and the rotating speed of a stirrer, then active calcium phosphate slurry subjected to reacting is directly added into a spray dryer, and the continuous production of active calcium phosphate is realized by controlling the temperature inside the spray dryer. The particle size of calcium phosphate obtained according to the production method disclosed by the invention is controllable, and by using a continuous production mode, the production efficiency is raised, and the stability of product quality is guaranteed.

Description

technical field [0001] The invention belongs to the field of chemical industry and relates to a production method of active calcium phosphate, in particular to a continuously operable production method of active calcium phosphate. Background technique [0002] Active calcium phosphate is an amorphous phosphate, scientific name calcium hydroxyphosphate, molecule Ca 10 (PO 4 ) 6 (OH) 2 , the English name Hydroxypatite (HAP), its product particle size is fine and uniform, good dispersion, large specific surface area, high activity, so it is also called hydroxyl active calcium phosphate. The substance is a non-toxic, odorless, non-corrosive white suspension or powder, insoluble in water, ethanol, acetone, soluble in inorganic acids. Active calcium phosphate suspension polymerization dispersant (HAP) is currently the most widely used suspension polymerization inorganic dispersant in the world, mainly used in polystyrene (PS), expandable polystyrene (EPS), acrylonitrile Suspe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/32
Inventor 尹继广祝桂林李明达
Owner LIANYUNGANG SHUREN KECHUANG FOOD ADDITIVE
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