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A kind of method for preparing lysine hydrochloride crystal

A technology of lysine hydrochloride and lysine hydrochloride feed solution, which is applied in the direction of cyanide reaction preparation, chemical instruments and methods, preparation of organic compounds, etc., can solve the problem of lysine hydrochloride crystal product quality Low, low impurity content and other issues, to achieve the effect of improving the first pass rate, low impurity content, and uniform particle size

Active Publication Date: 2015-09-02
COFCO BIOTECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defect that the lysine hydrochloride crystal product quality that existing method obtains is lower, provide a kind of preparation lysine that can efficiently obtain the crystalline product of uniform particle size, low impurity content and bulk density method for hydrochloride crystals

Method used

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Experimental program
Comparison scheme
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preparation example Construction

[0011] The method for preparing lysine hydrochloride crystals provided by the present invention comprises carrying out concentrated crystallization of lysine hydrochloride feed liquid, wherein, when the crystal content in the feed liquid reaches 20-50% by weight (preferably 20-40% by weight %, more preferably 25-35% by weight), the crystal slurry liquid obtained by concentrated crystallization is classified, and the conditions of classification are controlled so that the crystals with a particle diameter less than 425 μm are separated from the crystal slurry liquid, and part or all of the crystal slurry obtained by classification The crystal slurry liquid containing crystals with a particle size less than 425 μm is returned to be mixed with the lysine hydrochloride feed liquid for concentrated crystallization.

[0012] According to the present invention, the conditions of the concentrated crystallization can be the conditions routinely used in the art. Preferably, the condition...

Embodiment 1

[0022] The lysine hydrochloride feed liquid with lysine hydrochloride content of 50% by weight is continuously injected with an effective volume of 20m 3 In the crystallizer, carry out concentrated crystallization at 58 ℃, when the crystal content in the feed liquid reaches 25% by weight, control the feeding speed of the lysine hydrochloride feed liquid and the discharge speed of the crystal slurry liquid that the concentrated crystallization obtains Keep the crystal content in the feed liquid constant, and pass the crystal slurry obtained by concentrated crystallization (the particle size of the crystals contained is not more than 600 μm) into the hydrocyclone for classification, control the feed pressure to 0.2MPa, feed speed 3m 3 / h, so that the crystals with a particle size of less than 425 μm are separated from the crystal slurry, and the obtained crystal slurry containing crystals with a particle size of less than 425 μm is returned to the crystallizer together with the ...

Embodiment 2

[0025] The lysine hydrochloride feed solution with lysine hydrochloride content of 60% by weight is continuously injected with an effective volume of 20m 3 In the crystallizer, carry out concentrated crystallization at 58 ℃, when the crystal content in the feed liquid reaches 35% by weight, control the feeding speed of the lysine hydrochloride feed liquid and the discharge speed of the crystal slurry liquid that the concentrated crystallization obtains Keep the crystal content in the feed liquid constant, and pass the crystal slurry obtained by concentrated crystallization (the particle size of the crystals contained is not more than 600 μm) into the hydrocyclone for classification, control the feed pressure to 0.3MPa, feed speed 10m 3 / h, so that the crystals with a particle size of less than 425 μm are separated from the crystal slurry, and the obtained crystal slurry containing crystals with a particle size of less than 425 μm is returned to the crystallizer together with t...

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PUM

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Abstract

The invention discloses a method for preparing lysine hydrochloride crystals. The method includes concentration and crystallization of a lysine hydrochloride feed liquid, wherein when the content of the crystals in the feed liquid reaches 20-50 wt%, a crystal slurry obtained from concentration and crystallization is graded, a grading condition is controlled, crystals with the particle size of less than 425 [mu]m are allowed to be separated from the crystal slurry, and a part or all of the crystal slurry obtained from grading and containing the crystals with the particle size of less than 425 [mu]m is allowed to return back to be mixed with the lysine hydrochloride feed liquid together for concentration and crystallization. Through the technical scheme, the lysine hydrochloride crystals having uniform particle size, low content of impurities and high stacking density are obtained. Moreover, the method can improve the lysine hydrochloride product first-pass yield, allows the obtained crystal product to have no need of a sieving step, thereby improving the production efficiency of the lysine hydrochloride crystals.

Description

technical field [0001] The invention relates to a method for preparing lysine hydrochloride crystals. Background technique [0002] At present, the continuous production method of lysine hydrochloride crystal products in the industry includes: continuously injecting lysine hydrochloride feed liquid into an evaporation crystallizer for concentrated crystallization, then centrifuging the crystallized crystal slurry, and drying the centrifuged product The solid phase can be sieved to obtain the lysine hydrochloride crystal product, and the crystals with smaller particle sizes under the sieve are treated as waste materials, that is, they are dissolved and then concentrated and crystallized. [0003] The disadvantage of the above method is that the particle size of the crystal product obtained is not uniform enough, the impurity content is high and the bulk density is small, that is, the product quality is low, so that the product of lysine hydrochloride has a low first pass rate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C227/42C07C229/26
Inventor 周勇满云许贵珍李长辉
Owner COFCO BIOTECHNOLOGY CO LTD