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Method for adding assistant used in polymerization of polyvinyl chloride production

A technology of polyvinyl chloride and additives, applied in the field of polyvinyl chloride production technology, can solve problems such as unsafety, achieve the effects of reducing labor intensity, significant effect, and reducing environmental pollution

Inactive Publication Date: 2004-08-18
QILU PETRO CHEM - SINOPEC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the production of polyvinyl chloride by suspension method is developing in the direction of closed operation. Frequent disassembly and cleaning of the initiator feed pipe during the production process will inevitably bring greater limitations and unsafe factors to the closed production process.

Method used

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  • Method for adding assistant used in polymerization of polyvinyl chloride production
  • Method for adding assistant used in polymerization of polyvinyl chloride production

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Experimental program
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Embodiment Construction

[0012] Such as figure 1 , the initiator in the polymerization aid is azo-two-2,4-dimethylvaleronitrile (LB) and two-2-ethylhexyl peroxycarbonate (LE), and the flushing solvent is toluene (TU), The chain transfer agent is mercaptoethanol (NG2), the pH regulator is sodium hydroxide (BD), and the terminator is acetone thiocarbazone (ATSC).

[0013] The inlets of chain transfer agent, PH regulator, and terminator pipelines and common pipelines are slightly lower than the inlets of initiators, flushing solvents and common pipelines. The length of the common pipeline is 400 mm, and the inlets of chain transfer agent, pH regulator, terminator pipeline and common pipeline are 100 mm lower than the inlets of initiator, flushing solvent and common pipeline. After the polymerization aid finally enters the polymerization kettle through one inlet of a common pipe, a blind plate is added to the other inlet of the original polymerization kettle to form a hermetic seal.

[0014] According t...

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Abstract

The addition method of polymerization adjuvant in the production of polyvinyl chloride is characterized by that according to the respective addition order all the polymerization adjuvants can be fed into polymerization reaction still by means of a shared pipe finally. Said invention does not change its original production process, does not change composition and weight of the adjuvants anjd does not change the addition sequence of the adjuvants, only utilizes the action between the adjuvants, and adopts other polymerization adjuvant to fully flush the initiator feeding pipe so as to make the initiator feeding pipe can not produce self-polymerization and cohesion of plusticized material. Said present invention is safe, reliable, can reduce environment pollution.

Description

technical field [0001] The invention relates to a polyvinyl chloride production process, in particular to a method for adding a polymerization auxiliary agent to a polymerization kettle. Background technique [0002] The production of polyvinyl chloride by the suspension method uses vinyl chloride monomer as the raw material. In the production process, the polymerization raw material is added to the polymerization kettle, and the polymerization auxiliary agent needs to enter the polymerization kettle through another pipeline. In the existing production device, the initiator and flushing solvent enter the polymerization kettle through a pipeline, and the chain transfer agent (some PVC brand products do not need a chain transfer agent), pH regulator, and polymerization terminator pass through another pipeline. Entering the polymerization kettle, each product tank and the pipeline are equipped with program-controlled valves. The two pipelines enter ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F2/44C08F114/06
Inventor 刘振爱许志东李宝清
Owner QILU PETRO CHEM - SINOPEC