Clean production method of chlorinated polyethylene
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A technology for chlorinated polyethylene and cleaner production, applied in the field of cleaner production of chlorinated polyethylene, can solve the problems of difficulty in recycling, large discharge of waste water, heavy environmental pollution, etc. Process efficient effect
Active Publication Date: 2014-04-30
WEIFANG YAXING GRP CO LTD +1
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The disadvantage of the aqueous phase suspension method is that water is used as the chlorination medium. After the chlorination reaction, the by-product hydrogen chloride is absorbed to form dilute hydrochloric acid with a weight concentration of 5%-6%. Due to the low concentration of hydrochloric acid, it is difficult to recycle and the waste water discharge is large. Heavy environm
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Example Embodiment
[0018] Example 1:
[0019] at 12.5m 3 Into the chlorination reactor, inject 9720Kg of hydrochloric acid solution with a concentration of 17wt%, add 1100Kg of high-density polyethylene, 0.6Kg of fatty alcohol polyoxyethylene ether and 12Kg of talcum powder, stir for 5 minutes, prepare a suspension solution, and seal the reactor.
[0020] 900Kg of liquid chlorine was introduced into the suspension solution in the reactor to carry out chlorination reaction, the reaction temperature was 50-130 DEG C, and the reaction time was 3.5 hours to obtain chlorinated polyethylene slurry.
[0021] After cooling, the chlorinated polyethylene slurry is transported to the filter scrubber, and the filter is divided into two sections by the synchronous cooperation of the rotating filter disc and the filter controller, so as to realize the two sections of the slurry. The chlorinated polyethylene slurry passes through the first-stage filtration section, and the concentrated hydrochloric acid conta...
Example Embodiment
[0023] Embodiment 2:
[0024] at 60m 3 In the chlorination reactor, inject 43,200 Kg of hydrochloric acid solution with a concentration of 22 wt%, add 5,500 Kg of high-density polyethylene, 1.5 Kg of polyvinylpyrrolidone and 55 Kg of amorphous silica, stir for 10 minutes, prepare a suspension solution, and seal the reactor .
[0025] 4800Kg of liquid chlorine was introduced into the suspension solution in the reactor to carry out chlorination reaction, the reaction temperature was 30-130 DEG C, and the reaction time was 5 hours to obtain chlorinated polyethylene slurry.
[0026] After cooling, the chlorinated polyethylene slurry is transported to the filter scrubber, and the filter is divided into two sections by the synchronous cooperation of the rotating filter disc and the filter controller, so as to realize the two sections of the slurry. The chlorinated polyethylene slurry passes through the first-stage filtration section, and the concentrated hydrochloric acid containe...
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Abstract
The invention discloses a clean production method of chlorinated polyethylene. The clean production method adopts a hydrochloric acid phase suspension process which comprises the following steps: preparation of a supernatant solution, a chlorination process, a deacidification process, a centrifugation and drying process. The deacidification process includes two stages of filtration and deacidification; a chlorinated polyethylene slurry material is subjected to a first stage of filtration, a concentrated hydrochloric acid contained in the slurry material is filtered out and put into a concentration acid storage tank, subsequently the slurry material is subjected to a second stage of filtration, the acid residue in the slurry material is washed by water and filtered out to form a diluted hydrochloric acid, and then the diluted hydrochloric acid is put into a diluted acid storage tank. The production method disclosed by the invention has the beneficial effects that by the two stages of filtration and deacidification, the concentrated hydrochloric acid in the slurry material is totally recycled and sold after the chlorination reaction, and the diluted hydrochloric acid generated by washing the slurry material after the reaction is totally recycled as well, thus zero emission of acidic water generated after the chlorination reaction and during filtration and washing is realized, the energy conservation and emission reduction effects are obvious, the production cost is further lowered, and the production process is efficient, clean and environment-friendly.
Description
technical field [0001] The invention relates to a clean production method of chlorinated polyethylene. Background technique [0002] Chlorinated polyethylene is a polymer material obtained by chlorination substitution reaction of high-density polyethylene. It is mainly used as a resin impact modifier and synthetic rubber. [0003] At present, the main method of producing chlorinated polyethylene at home and abroad is the suspension method. There are two production processes of aqueous phase suspension method and hydrochloric acid phase suspension method in the production of chlorinated polyethylene by suspension method. The disadvantage of the aqueous phase suspension method is that water is used as the chlorination medium. After the chlorination reaction, the by-product hydrogen chloride is absorbed to form dilute hydrochloric acid with a weight concentration of 5%-6%. Due to the low concentration of hydrochloric acid, it is difficult to recycle and the waste water discharg...
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