A kind of tower draws the preparation method of industrial tannic acid

A kind of tower draws the preparation method of industrial tannic acid

  • CN 102,140,121 B
  • Filed: 01/28/2010
  • Issued: 09/09/2015
  • Est. Priority Date: 01/28/2010
  • Status: Active Grant
First Claim
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1. tower draws a preparation method for technical grade Weibull, it is characterized in that comprising the following steps:

  • The first step, commercial tower draws powder to adopt 400 type pulverizers, 3700rpm, at the bottom of 80 ~ 100 mesh sieves;

    Second step, tower draws powder extracting technology to adopt the two dynamic countercurrent extraction process of low temperature two tank three step, and drawn by tower powder raw material and water to add two dynamic extraction device, intensification, insulation, extraction, prepare tower draw powder solid-liquid and extract mixed solution, concrete steps are as follows;

    One step extraction temperature;

    35 ~ 45 DEG C, two step extraction temperatures;

    40 ~ 50 DEG C, three step extraction temperatures;

    45 ~ 55 DEG C;

    One step extraction time;

    0.5 ~ 1 hour, two step extraction times;

    0.5 ~ 1 hour, three step extraction times;

    0.5 ~ 1 hour;

    One step lixiviate solid-to-liquid ratio;

    1;

    5 ~ 6, two step lixiviate solid-to-liquid ratios;

    1;

    4 ~ 5, three step lixiviate solid-to-liquid ratios;

    1;

    3 ~ 4;

    3rd step, tower draw powder solid-liquid extracts mixed solution and is separated employing screw settling centrifugal separation process;

    Tower draw powder solid-liquid extracts mixed solution containing solid concentration 20 ~ 15%, solid phase particles degree >

    =0.005mm, solid-liquid difference in specific gravity >

    =0.005;

    Wherein, tower draw powder solid-liquid extracts mixed solution separating device and selects LW horizontal spiral discharge sedimentation centrifuge;

    4th step, tower draw powder solid-liquid extraction and isolation liquid adopts foam separation, settlement separate coupled combination metallization processes, and the foam separation of tower draw powder solid-liquid extraction and isolation liquid, settlement separate coupling metallization processes equipment adopt level Four diffusion, couplingization separating device;

    5th step, the foam separation of tower draw powder solid-liquid extraction and isolation liquid, settlement separate liquid are through filter press process filtration, and plate-and-frame filter press selects universal plate-and-frame filter press, and material avoids iron;

    6th step, the foam separation of tower draw powder solid-liquid extraction and isolation liquid, the filter press liquid of settlement separate liquid are through short tube evaporation or falling film evaporation is concentrated, namely obtain product tower after centrifugal spray drying or pressure spray dryer draws industrial tannic acid.

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