Unlock instant, AI-driven research and patent intelligence for your innovation.

Method and apparatus for purifying polyarylene sulfide

A technology of polyarylene sulfide and refining method, which is applied in the field of high molecular weight polyarylene sulfide refining method and its refining device, and can solve the problem of shortened life of insulating parts, expensive capacitive liquid level detector, and difficult accuracy Ground detection and other issues

Inactive Publication Date: 2005-08-03
IDEMITSU KOSAN CO LTD
View PDF2 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, after further repeated research, it was found that since the insulating part of the capacitive detector is made of materials such as ceramics and Teflon (registered trademark), when it is used under high temperature and high pressure, if it is dissolved with Contact with non-protic organic solvents such as highly sensitive NMP will shorten the life of the insulating part
[0012] In addition, since the capacitive detector detects the place where the voltage changes sharply as the liquid level, if the electrolyte concentration in the solution, such as the lithium concentration, changes, it is difficult to accurately detect the polymer phase due to the change in the indicated value of the detector. liquid level
[0013] Further, since the capacitive liquid level detector is very expensive, it cannot be said that using it to detect the liquid level is not necessarily the most suitable method when producing polyarylene sulfide cheaply.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method and apparatus for purifying polyarylene sulfide
  • Method and apparatus for purifying polyarylene sulfide
  • Method and apparatus for purifying polyarylene sulfide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0081] Refer to the following figure 1 , an embodiment of the present invention will be described.

[0082] figure 1 It is a schematic diagram of an embodiment of the polyarylene sulfide manufacturing device of the present invention, and Fig. 2 is a schematic diagram of a vibrating process viscometer, image 3 It is a schematic diagram of a mobile sealed differential pressure transmitter. Also, in Figure 2 and image 3 neutralize figure 1 The same components are given in and figure 1 The same symbols in , and their descriptions are omitted.

[0083] exist figure 1 Among them, 1 is the reactor, 2 is the pipeline of the transportation process, 3 is the static separator, 4 is the mixer, and 5 is the control valve.

[0084] The reaction kettle 1 and the refining separator 3 are connected through the pipeline 2 of the transportation process. The static separator 3 is provided with 3 consecutive sections, which are connected by a pipeline 2 . A mixer 4 is provided on the wa...

Embodiment 1

[0110] Synthesis of poly(arylene sulfide)

[0111] To the raw material synthesis kettle (1m 3 ), add 554kg N-methyl-2-pyrrolidone (NMP) and 100kg lithium hydroxide (LiOH·1H 2 O), the temperature was raised and kept at 140° C., and the moisture contained in the raw material LiOH was distilled off in batches. After this operation is finished, keep at 130 ℃, pass into 65Nkl gaseous hydrogen sulfide (H 2 S). Lithium hydrosulfide (LiSH) was synthesized from the following formula (1) by this operation.

[0112] (1)

[0113] Then, the introduction of hydrogen sulfide was stopped, and the temperature of the synthesis kettle was raised to 205° C. again. Accompanied by the temperature rise, the water by-produced when hydrogen sulfide is introduced is removed by rotary distillation, and the reaction of the following (2) formula is carried out at the same time to synthesize lithium sulfide (Li 2 S).

[0114] (2)

[0115] After the reaction of above-mentioned (...

Embodiment 2

[0123] Except that the material of the wetted parts is Hastelloy corrosion-resistant nickel-based corrosion-resistant heat-resistant alloy, the mobile seal type differential pressure transmitter (manufactured by Yamatake Industry System Co., Ltd., JTE-929A) is set on the static separator, instead of the embodiment Except for the vibrating process viscometer in 1, poly(arylene sulfide) was synthesized in the same manner as in Example 1, and the viscosity and molecular weight were measured. The results are shown in Table 1.

[0124] The viscosity and molecular weight of the polyarylene sulfide obtained in this example showed the same value everywhere, and the long-term continuous and stable operability of the production equipment could be confirmed.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A method of purifying a polyarylene sulfide, including washing a polyarylene sulfide with a wash liquid, separating the resulting mixture into a polymer phase (8) containing the polyarylene sulfide and a solution phase (9) containing the wash liquid, measuring a viscosity of the polymer phase (8) or a difference in viscosity between the polymer phase (8) and the solution phase (9) to detect the liquid level (10) of the polymer phase (8), and taking out the polymer phase (8). The viscosity of the polymer phase (8) or the difference in density between the polymer phase (8) and the solution phase (9) is measured with a vibratile process viscometer (7) or remote seal type differential pressure oscillator (6) having a liquid-contact portion (11) constituted of stainless steel, a hastelloy alloy, Ti or a Ti alloy, so that the liquid level (10) of the polymer phase (8) can be accurately detected.

Description

technical field [0001] The invention relates to a refining method of polyarylene sulfide and a refining device thereof. More specifically, it relates to a method for refining high-molecular-weight poly(arylene sulfide), which is particularly useful in the field of electricity and electronics, and the field of high-rigidity materials, and its refining device. Background technique [0002] Polyarylene sulfide resins, especially polyphenylene sulfide resins, are known as engineering resins that are excellent in mechanical strength, heat resistance, etc., and have particularly high rigidity, and can be used in electrical appliances. , Materials for electronic instrument components and various high rigidity materials. [0003] In the manufacture of polyarylene sulfide resins, it is generally used at present to vulcanize alkali metals such as sodium sulfide in an aprotic organic solvent (polymerization solvent) such as N-methyl-2-pyrrolidone (NMP). A method of reacting a compoun...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C08G75/00C08G75/02C08G75/0281
CPCC08G75/0281C08G75/0213C08G75/0254
Inventor 小山义成
Owner IDEMITSU KOSAN CO LTD