Reaction system for preparing polymer polyol and method for preparing polymer polyol

Patent metadata

Field	Value
Publication number	US-12565557-B2
Application number	US-202017995384-A
Country	US
Kind code	B2
Filing date	Apr 3, 2020
Priority date	Apr 3, 2020
Publication date	Mar 3, 2026
Grant date	Mar 3, 2026

Abstract

A reaction system for preparing polymer polyol and a method for preparing polymer polyol. The reaction system comprises a reactor, a first circulation unit, a second circulation unit, and a flow direction switching unit, wherein the reaction cavity of the reactor is divided into a first reaction chamber and a second reaction chamber by a partition plate, and the top of the partition plate is provided with an overflow port to communicate the first reaction chamber and the second reaction chamber with each other; the first circulation unit enables the material in the first reaction chamber to circulate between the discharge port of the first reaction chamber and the feed port of the first reaction chamber; the second circulation unit enables the material in the second reaction chamber to circulate between the discharge port of the second reaction chamber and the feed port of the second reaction chamber. The polymer polyol prepared by the reaction system has a low-viscosity effect, and by using the polymer polyol prepared by the method, a polyurethane foam having excellent mechanical properties and high hardness can be obtained.

First claim

What is claimed is:

1 . A reaction system for preparing polymer polyol, wherein the reaction system comprises a reactor ( 4 ), a first circulation unit ( 1 ), a second circulation unit ( 2 ) and a flow direction switching unit ( 3 ),
wherein a partition plate ( 43 ) is provided within a reaction cavity of the reactor ( 4 ), and the reaction cavity is divided into a first reaction chamber ( 41 ) and a second reaction chamber ( 42 ) by the partition plate ( 43 ), the volume of the first reaction chamber ( 41 ) is greater than the volume of the second reaction chamber ( 42 ), and the top of the partition plate ( 43 ) is provided with an overflow port ( 44 ) to communicate the first reaction chamber ( 41 ) and the second reaction chamber ( 42 ) with each other; the first circulation unit ( 1 ) is arranged between a discharge port and a feed port of the first reaction chamber ( 41 ) and enables material in the first reaction chamber ( 41 ) to circulate between the discharge port of the first reaction chamber ( 41 ) and the feed port of the first reaction chamber ( 41 ); the second circulation unit ( 2 ) is arranged between a discharge port and a feed port of the second reaction chamber ( 42 ) and enables material in the second reaction chamber ( 42 ) to circulate between the discharge port of the second reaction chamber ( 42 ) and the feed port of the second reaction chamber ( 42 ); and the flow direction switching unit ( 3 ) is configured to switch material in the first circulation unit ( 1 ) either to flow to the feed port of the first reaction chamber ( 41 ) or to flow to the feed port of the second reaction chamber ( 42 ), or switch material in the second circulation unit ( 2 ) either to flow to the feed port of the second reaction chamber ( 42 ) or to flow to the feed port of the first reaction chamber ( 41 ).

2 . The reaction system according to claim 1 , wherein the first circulation unit ( 1 ) comprises a first circulation line ( 12 ) connected between the discharge port and the feed port of the first reaction chamber ( 41 ), wherein the first circulation line ( 12 ) is sequentially provided with a first circulating pump ( 13 ), the cooler ( 11 ) and a first valve ( 15 ) in an upstream-to-downstream direction thereof;
the second circulation unit ( 2 ) comprises a second circulation line ( 22 ) connected between the discharge port and the feed port of the second reaction chamber ( 42 ), wherein the second circulation line ( 22 ) is sequentially provided with a second circulating pump ( 23 ), the heater ( 21 ) and a second valve ( 24 ) in an upstream-downstream direction thereof; and the flow direction switching unit ( 3 ) comprises a switching line ( 31 ) connected between the first circulation line ( 12 ) and the second circulation line ( 22 ), wherein the switching line ( 31 ) is provided with a third valve ( 32 ).

3 . The reaction system according to claim 2 , wherein the switching line ( 31 ) is connected to the first circulation line ( 12 ) at a position upstream of the first valve ( 15 ), and the switching line ( 31 ) is connected to the second circulation line ( 22 ) at a position upstream of the second valve ( 24 ).

4 . The reaction system according to claim 3 , wherein the reaction system further comprises a first feed line ( 5 ) and a second feed line ( 6 ),
wherein the first feed line ( 5 ) is configured to deliver a material to the first reaction chamber ( 41 ) or the second reaction chamber ( 42 ); and the second feed line ( 6 ) is configured to deliver a material to the second reaction chamber ( 42 ).

5 . The reaction system according to claim 4 , wherein the first feed line ( 5 ) is connected to the first circulation line ( 12 ), and in the upstream-to-downstream direction of the first circulation line ( 12 ), the position where the first feed line ( 5 ) and the first circulation line ( 12 ) are connected is upstream of the position where the switching line ( 31 ) and the first circulation line ( 12 ) are connected; and/or
the second feed line ( 6 ) is connected to the second circulation line ( 22 ).

6 . The reaction system according to claim 1 , wherein the ratio of the height of the partition plate ( 43 ) to the height of the reactor ( 4 ) is 0.6-0.96:1.

7 . The reaction system according to claim 1 , wherein an inner diameter of the reactor ( 4 ) perpendicular to the middle part of the partition plate ( 43 ) is divided by the partition plate into an inner diameter section L1 located in the second reaction chamber ( 42 ) and an inner diameter section L2 located in the first reaction chamber ( 41 ), and the ratio of L1 to L2 is 1:3.8-5.4; and/or
the ratio of the volume of the first reaction chamber ( 41 ) to the volume of the second reaction chamber ( 42 ) is 4.0-19.0.

8 . A method for preparing polymer polyol, wherein a reaction system for preparing polymer polyol comprises a reactor ( 4 ), a reaction cavity of the reactor ( 4 ) is divided by a partition plate ( 43 ) into a first reaction chamber ( 41 ) and a second reaction chamber ( 42 ), the volume of the first reaction chamber ( 41 ) is greater than the volume of the second reaction chamber ( 42 ), and the top of the partition plate ( 43 ) is provided with an overflow port ( 44 ) to communicate the first reaction chamber ( 41 ) and the second reaction chamber ( 42 ) with each other;
and the method comprises the following steps: 1) In a first reaction stage: adding a first reaction material to the second reaction chamber ( 42 ) and heating the first reaction material; when the temperature of the first reaction material reaches a first temperature, continuously adding part of a second reaction material to the second reaction chamber ( 42 ), and maintaining the reaction temperature at the first temperature for a time period; 2) In a second reaction stage: maintaining the reaction temperature at a temperature near the first temperature by stopping adding the second reaction material to the second reaction chamber ( 42 ) when the reaction temperature of the reaction system in the first reaction stage rises by 0.5° C. or more, continuously adding the remaining second reaction material to the first reaction chamber ( 41 ), reacting the second reaction material with the first reaction material and/or the second reaction material and/or a reaction product thereof that overflows from the second reaction chamber ( 42 ) to the first reaction chamber ( 41 ) through the overflow port ( 44 ); and 3) In an aging stage: after the feeding of the second reaction material is completed, delivering all material remaining in the second reaction chamber ( 42 ) after the second reaction stage to the first reaction chamber ( 41 ) to mix with the material in the first reaction chamber ( 41 ) and age.

9 . The method according to claim 8 ,
in the first reaction stage, all material present in the second reaction chamber ( 42 ) during the first reaction stage flows out from the discharge port of the second reaction chamber ( 42 ) and circulates through a second circulation unit ( 2 ) to the feed port of the second reaction chamber ( 42 ); in the first reaction stage, a flow direction switching unit ( 3 ) is activated so that the first reaction material and/or the second reaction material and/or a reaction product thereof that overflows from the second reaction chamber ( 42 ) into the first reaction chamber ( 41 ) through the overflow port ( 44 ) flows into a first circulation unit ( 1 ) through the discharge port of the first reaction chamber ( 41 ) and flows into the feed port of the second reaction chamber ( 42 ) under the action of the flow direction switching unit ( 3 ); in the second reaction stage, the flow direction switching action of the flow direction switchin

Assignees

• Wanhua Chemical Group Co Ltd

Inventors

• Li Fuguo
• Liu Yang
• Jiang Ming
• Qin Chengqun
• Fang Shiqiang

Classifications

• C08G18/65

  Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen {(C08G18/2805 takes precedence)} · CPC title

• B01J2219/00105

  part or all of the reactants being heated or cooled outside the reactor while recycling · CPC title

• B01J19/2465

  externally, i.e. the mixture leaving the vessel and subsequently re-entering it · CPC title

• B01J2219/00164

  controlling the flow · CPC title

• B01J2219/00087

  with heat exchange elements outside the reactor · CPC title