Method for producing acrylic amide crystal

A technology of acrylamide crystals and production methods, applied in the separation/purification of carboxylic acid amide, organic chemistry, etc., can solve the problems that the secondary nucleation method has not been reported, and achieve low cost, simple method, and low water content Effect

Inactive Publication Date: 2009-03-25
TSINGHUA UNIV +1
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[0005] There is no report on the application of the secondar

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  • Method for producing acrylic amide crystal
  • Method for producing acrylic amide crystal

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Embodiment 1

[0022] Preparation and detection of embodiment 1 acrylamide crystal

[0023] (1) Pass 2000kg of acrylamide aqueous solution with a temperature of 40°C and a concentration of 630g / L into a volume of 5m 3 In the jacketed stirred crystallization tank; the frozen brine with a temperature of -5°C is passed into the jacket to cool the acrylamide aqueous solution to 25°C;

[0024] (2) Add 1.6 kg of acrylamide crystals with a particle size of 0.2 mm to the acrylamide aqueous solution; continue to cool down to 6° C., and keep the temperature at 6° C. for 30 minutes to obtain the acrylamide crystallization mother liquor;

[0025] (3) Pour the acrylamide crystallization mother liquor into a two-stage pusher centrifuge for centrifugation; and dry the centrifuged product on a vibrating fluidized bed to obtain 261 kg of acrylamide crystals.

[0026] Microscopic observation of acrylamide crystals: take the centrifuged acrylamide crystals and place them under a microscope for observation. As...

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Abstract

The invention discloses a production method of acrylamide crystals, which pertains to the field of biochemical industry. The method mainly comprises the steps that: acrylamide aqueous solution with high concentration is treated with cooling crystallization in a jacket-stirring crystallization kettle, after the temperature is reduced to 20 to 30 DEG C, acrylamide fine crystals with the granularity of 0.08 to 0.80mm are added to be taken as seed crystals to induce the acrylamide crystals to carry out secondary core formation, the temperature is reduced to 3 to 6 DEG C and the crystals grow for 20 to120min, and then the acrylamide crystals are obtained after centrifugation and drying. The production method does not need additional new equipment, is not easy to form crystal scars in the crystallization process, and has high crystal granularity, good crystal quality and less energy consumption.

Description

technical field [0001] The invention belongs to the field of biochemical industry, in particular to a production method of acrylamide crystals. Background technique [0002] Acrylamide (Acrylamide, molecular formula C 3 h 5 NO, the structural formula is H 2 C=CHCONH 2 ) is an important chemical raw material. Various types of polyacrylamide (PAM) can be synthesized after polymerization of acrylamide monomer, which has a very wide range of applications in industrial production such as tertiary oil recovery, water treatment, papermaking, mining, coal washing, and manufacturing of superabsorbent resins. [0003] Acrylamide is generally produced by hydrating acrylonitrile to form acrylamide aqueous solution, and then preparing acrylamide crystals by cooling down. Such as the patent "Preparation Method of Acrylamide Crystal" (Patent No.: ZL86103400) of Mitsui Topress Chemical Co., Ltd. of Japan, and the patent "Manufacture Method of Acrylamide Crystal" (Patent No.: ZL98126463...

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Application Information

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IPC IPC(8): C07C233/09C07C231/24
Inventor 于慧敏顾宏军张曙良孙世良沈忠耀
Owner TSINGHUA UNIV
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