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Equipment and method for recovering vinyl chloride monomers during production of vinyl chloride paste resin through micro-suspension method

A technology for vinyl chloride monomer and production process, applied in the field of recovering vinyl chloride monomer, can solve the problems of difficult processing, no gas flow rate of a defoaming tower, no practical reference value and operability, etc., and achieves simple structure, Good defoaming performance

Active Publication Date: 2017-01-11
TANGSHAN SANYOU CHLOR ALKALI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method does not give the key parameters of the size of the barbed wire, the thickness of the wire, the number of layers of barbed wire in the degassing tower and the distance between layers, nor does it give the gas flow rate in the degassing tower, so there is no practical reference value and operability
In addition, it is not easy to process
There is no real solution to the above problems at home and abroad so far

Method used

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  • Equipment and method for recovering vinyl chloride monomers during production of vinyl chloride paste resin through micro-suspension method
  • Equipment and method for recovering vinyl chloride monomers during production of vinyl chloride paste resin through micro-suspension method
  • Equipment and method for recovering vinyl chloride monomers during production of vinyl chloride paste resin through micro-suspension method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] The latex after the polymerization reaction (48.5°C, pH 9.0, solid content of 45%, vinyl chloride conversion rate of about 90%) was discharged into unloading tank 4 (15 minutes), according to the installation at the bottom of unloading tank 4. The displayed value of the first pH meter 3 is passed into a 5% dilute sulfuric acid solution 2 to adjust the pH to 4.5, and the degassing tower 9 (using a single tower, with 10 layers of metal grids, and a layer spacing of 800mm) is opened to the inlet valve of the ventilation cabinet, and the inlet valve of the ventilation cabinet is opened to the gas cabinet. Enter the defoamed vinyl chloride, control the pressure 15 to 0.03Mpa (table), open the steam heating coil steam inlet control valve 6, and let in steam.

[0078] Latex samples were taken every 30 minutes for analysis of vinyl chloride residues. Every 30 minutes, visually observe the foam situation from the glass sight glass 16 at the outlet of the defoaming tower, as show...

Embodiment 2

[0087] The latex after the polymerization reaction (49°C, PH8.6, solid content 41%, vinyl chloride conversion rate of about 90%) is unloaded into the discharge tank 4, and the defoaming tower 9 is opened, and the defoaming tower 9 adopts a double tower (not shown), the metal grid of each tower is 8 layers, the layer spacing is 800mm) the inlet valve of the ventilation cabinet, the defoamed vinyl chloride is fed into the gas cabinet, the control pressure 15 is 0.03Mpa (table), and the steam heating plate is turned on. The steam inlet control valve 6 is used for introducing steam, and the amount of steam is preferably 77-82° C. of latex temperature, and the above process conditions are maintained.

[0088] Latex samples were taken every 30 minutes for analysis of vinyl chloride residues. Every 30 minutes, the foam condition was visually inspected from the glass sight glass 16 at the outlet of the defoaming tower. As in Table 1. Every 30 minutes, the foam situation was visually...

Embodiment 3

[0097] The latex after the polymerization reaction (47°C, PH8.7, solid content of 43%, vinyl chloride conversion rate of about 90%) is unloaded into the discharge tank 4 (15 minutes), according to the tank bottom PH meter 3 display value Pour 5% dilute sulfuric acid solution 2 to adjust the pH to 6.5, open the inlet valve of the fume cupboard (single tower, 10 layers of metal grid, 800mm interlayer spacing) of the defoaming tower, and pass the defoamed vinyl chloride into the gas cupboard. , the control pressure 15 is 0.03Mpa (table), open the steam heating coil steam inlet control valve 6, and pass in the steam, the steam volume is suitable for the latex temperature of 77 ~ 82 ℃, and the above process conditions are maintained.

[0098] Latex samples were taken every 30 minutes for analysis of vinyl chloride residues. Every 30 minutes, the foam condition was visually inspected from the glass sight glass 16 at the outlet of the defoaming tower 9 . The following table:

[009...

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Abstract

The invention relates to equipment for producing vinyl chloride paste resin, and in particular relates to equipment and a method for recovering vinyl chloride monomers during production of the vinyl chloride paste resin through a micro-suspension method. A discharge spout is connected with a defoaming tower and a stripping tower respectively, a grid plate is arranged in the defoaming tower, and a spine structure is arranged at the lower part of the grid plate. Latex after a polymerization reaction is discharged into the discharge spout, acid liquor is introduced according to a pH value at the bottom of the discharge spout to adjust the pH value of polyvinyl chloride latex to be 4-7, a valve of a ventilation cabinet of the defoaming tower is opened, vinyl chloride after defoaming is introduced into the ventilation cabinet, an adjusting valve of a steam coil is opened, steam is introduced into the discharge spout, and the condition of bubbles is visually inspected from a glass viewing mirror at an outlet of the defoaming tower every 30 minutes; and a vacuum pump of the stripping tower is opened, and the latex with the vinyl chloride monomers of which the mass content is 80% or more removed in the discharge spout is delivered to the stripping tower by using a delivery pump. By virtue of pH adjustment and a defoaming mode combining the defoaming tower and the discharge spout, a defoaming agent does not need to be added during recovery, so that the production cost is reduced.

Description

technical field [0001] The present invention relates to a vinyl chloride paste resin production equipment, in particular to a device and a method for recovering vinyl chloride monomer in the production process of the micro-suspension method vinyl chloride paste resin. Background technique [0002] Polyvinyl chloride (PVC) paste resin, as the name implies, is mainly used in the form of paste. People often use this paste as plastisol, which is a unique liquid form of polyvinyl chloride plastic in the unprocessed state. . Paste resins are often made from latex and microsuspension methods. [0003] Due to the fine particle size, the PVC paste resin has a texture like talcum powder and is immobile. Polyvinyl chloride paste resin is mixed with plasticizer to form a stable suspension after stirring, which is called PVC paste, or PVC plastisol, PVC sol, and it is in this form that people use it to process the final product. product. In the process of paste making, various filler...

Claims

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Application Information

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IPC IPC(8): C08F14/06C08F6/24
CPCC08F6/24C08F14/06C08L27/06
Inventor 刘明杰李明徐建玲孔令媛王峰李德军刘洋刘黎周云飞孙英华牛应东赵丽颖杜建军赵琳周爱存曹战国刘川吕彦玲
Owner TANGSHAN SANYOU CHLOR ALKALI
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