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Method and device for feeding polymerization liquid

A liquid and liquid pipeline technology, applied in the field of transporting polymerizable liquids, can solve the problems of reducing the working failure, damage and leakage of extrusion sliding parts

Inactive Publication Date: 2008-02-20
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this seal also leaks when the fluid is polymerized by the polymerization reaction, because the polymer is generated and firmly bonded to the sealing surface and the bellows part, reducing the function of the squeeze sliding part or causing work failure, because the pump shaft The rotational force concentrates on the bellows causing damage which further suffers from leakage

Method used

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  • Method and device for feeding polymerization liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A mechanical seal pump of the external flushing type shown in Figure 1 was used as the pump for removing bottoms from the column containing a large amount of acrylic acid heavy condensate. The feed liquid of the column is used as the external flushing liquid. In the flushing line, the 100-mesh filter is arranged in parallel, and U-shaped pressure gauges are arranged on the upstream and downstream sides of the filter, so that when the pressure difference in the filter part increases, the line can be switched. Steam quenching was also performed.

[0038] As a result, the fluid can be transferred for 1 year without causing any problems.

[0039] Next, the mechanical seal shown in Fig. 1 is explained.

[0040] The rotary shaft 1 is arranged so as to pass through the housing 2 , the seal cover 3 and the end cover 4 . The rotary-side sealing surface 11 has been connected to the rotary shaft 1 via the rotary-side sleeve 10 . The bellows 22 and the face holder 23 have been ...

Embodiment 2

[0042] A self-flushing type mechanical seal pump was used as the pump for withdrawing the distillate from the column containing a large amount of acrylic acid. The pump was operated while the polymerization inhibitor was added to the rinse liquid in an amount corresponding to 100 ppm. As a result, the liquid can be transferred for 1 year without causing any problems.

Embodiment 3

[0046] A self-flushing type (liquid temperature: 70° C.) was used as a pump for discharging the residue from the acrylic acid purification tower. A heat exchanger for cooling is arranged for flushing liquid lines. Run the pump while reducing the temperature of the liquid to 25-30°C. As a result, the liquid can be transferred for 1 year without causing any problems.

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Abstract

A subject for the invention is to provide a method of transferring a polymerizable liquid by which the polymerizable liquid can be stably transferred without arousing any mechanical-seal trouble over long. The invention provides a method of transferring a polymerizable liquid with a pump which has a mechanical seal having seal faces (11) and (24) and has a flushing liquid line for supplying a flushing liquid to a flushing liquid introduction opening (30) of the mechanical seal, wherein the flushing liquid line is equipped with a strainer, a device for adding a polymerization inhibitor, or a flushing liquid cooler.

Description

technical field [0001] The present invention relates to a method and apparatus for transporting polymerizable liquids such as acrylic or methacrylic acid. More specifically, the present invention relates to a method and apparatus for transporting a polymerizable liquid using a pump device with a mechanical seal. Background technique [0002] It is known that polymerizable liquids often cause problems during the preparation steps, storage or transport, due to the polymerisation by the action of heat or light or due to other factors. Addition of polymerization inhibitors such as phenothiazine or phenolic compounds such as hydroquinone and its derivatives, and exposure to oxygen-containing gas are known to be effective methods of preventing such problems (ie, preventing polymerization of polymerizable compounds). These are widely used techniques. [0003] There are cases where mechanical seals are used as liquid transfer pump seals. [0004] The mechanical seal includes a dr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16J15/34B01J4/00F16N17/00C07C57/07C07C51/42C07C51/50B67D5/02B67D7/02F04D29/12
CPCF16J15/3404B01J4/001B01J2219/00247F04D29/128
Inventor 矢田修平强力正康清水祯弘
Owner MITSUBISHI CHEM CORP
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