Production technology of food-grade polyvinylidene chloride resin

A polyvinylidene chloride and production process technology, which is applied in the production process field of food-grade polyvinylidene chloride resin, can solve the problems of low production efficiency, long monomer consumption time, and waste of time, so as to improve synthesis efficiency and save time Effect

Active Publication Date: 2015-10-21
南通汇羽丰新材料有限公司
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AI-Extracted Technical Summary

Problems solved by technology

The disadvantages of this recovery process are: first, the second process takes a long time to recover the monomer in the resin slurry, which prolongs the waiting time for cleaning the polymerization tank; second, after the third process completes the ...
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Method used

D, the monomer to be recovered in the slurry treatment tank is transferred from the slurry treatment tank to the new foam elimination tank, and the resin carried by the monomer gas is removed in the foam elimination tank, and the monomer gas is removed in the follow-up equipment Condensate and recover, the resin is returned to the slurry treatment tank, and then continue to recover the monomer in the resin slurry in the slurry treatment tank by vacuum recovery, stop when the pressure in the slurry treatment tank reaches +0.1~-0.05MPa, and the time is 15~ 40 minutes. At the same time, the polymerization tank is repressurized with nitrogen, and the repressurization is stopped when the pressure returns to atmospheric pressure, and then the polymeriza...
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Abstract

The invention discloses a production technology of food-grade polyvinylidene chloride resin. A polymerization tank can be cleaned in the monomer recycling process by adjusting monomer recycling steps and adding a foam eliminating tank and a washing liquid temporary storage tank, and the cleaning is ended without waiting monomers are completely recycled, so that the time of 100-200 minutes is saved, and the synthetic efficiency of the polyvinylidene chloride resin is improved by 3.5% to 7%.

Technology Topic

ChemistryPolyvinylidene chloride +3

Examples

  • Experimental program(1)

Example Embodiment

[0020] The present invention will be further described in detail below through examples. The following examples are for explaining the present invention and the present invention is not limited to the following examples.
[0021] The production process of the food-grade polyvinylidene chloride resin of the present invention includes the following steps:
[0022] A. Polymerization feed. After the pure water used for suspension polymerization is put into the polymerization tank in a predetermined amount, the polymerization tank is evacuated. After the vacuum degree of the polymerization tank meets the requirements, the vinylidene chloride monomer, comonomer, and initiator , The additives corresponding to the dispersant are put into the polymerization tank according to the predetermined input amount, and then the predetermined stirring speed and stirring time are used to disperse the polymerized monomer. After the monomer dispersion is over, the temperature of the polymerization system is raised to the polymerization initiation temperature, and the monomer starts to undergo polymerization at the predetermined polymerization temperature and pressure. When the monomer conversion rate reaches the predetermined requirements, that is, the polymerization temperature and polymerization time meet the predetermined requirements. At that time, a polymerization terminator was added to terminate the polymerization reaction.
[0023] B. Transfer the polyvinylidene chloride resin slurry in the polymerization tank to the slurry treatment tank. During the process of transferring the polyvinylidene chloride resin slurry in the polymerization tank to the slurry treatment tank, flash the vinylidene chloride monomer and copolymerize it. The monomer is recovered until the end of the slurry transfer, and it takes 30 to 90 minutes to the end of the slurry transfer.
[0024] C. The residual monomer in the polymerization tank is recovered by the vacuum recovery method, and it ends when the pressure of the polymerization tank reaches -0.05~-0.08MPa;
[0025] D. Transfer the monomer to be recovered in the slurry treatment tank from the slurry treatment tank to the newly-added foam elimination tank. The resin carried by the monomer gas is removed in the foam elimination tank, and the monomer gas is condensed and recovered in the subsequent equipment , The resin is returned to the slurry treatment tank, and then the monomer in the resin slurry in the slurry treatment tank is continuously recovered by the vacuum recovery method. When the pressure in the slurry treatment tank reaches +0.1~-0.05MPa, it will stop, and the time will be 15-40 minutes. At the same time, the polymerization tank is re-pressured with nitrogen, and the re-pressure is stopped when the pressure returns to atmospheric pressure, and then the polymerization tank is washed and cleaned. The water washing liquid is collected in the temporary storage tank, which is equipped with a liquid level automatic control device. Effectively prevent the overflow of the washing liquid.
[0026] E. Use vacuum negative pressure recovery method to recover the residual monomers in the slurry treatment tank, stop when the pressure in the slurry treatment tank reaches -0.06~-0.09MPa, and the recovery time reaches 110-210 minutes.
[0027] F. Transport the washing liquid in the temporary storage tank to the slurry treatment tank for washing of the polyvinylidene chloride resin slurry.
[0028] In order to realize the automatic control operation of the above-mentioned new process technology route, a new automatic operation program is compiled, and the production operation control is carried out by the DCS control method.
[0029] The production process of the food-grade polyvinylidene chloride resin of the present invention adjusts the monomer recovery step and adds a foam elimination tank and a temporary storage tank for washing liquid, so that the polymerization tank can be cleaned during the monomer recovery process. There is no need to wait until the monomer recovery is all over, thus saving 100-200 minutes of time and improving the synthesis efficiency of polyvinylidene chloride resin by 3.5% to 7%.

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