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Device and method for continuously synthesizing poly (propylene carbonate) polyols

A polypropylene carbonate and polyol technology, applied in the chemical industry, can solve the problems of low gas-liquid two-phase mass transfer rate, non-continuous production, and low product quality, so as to improve CO2 utilization rate, reduce raw material consumption, and improve Yield effect

Active Publication Date: 2016-01-06
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the above two synthesis processes, due to poor gas-liquid mixing, the gas-liquid two-phase mass transfer rate is low, resulting in high equipment investment, high production energy consumption, low raw material utilization rate, and low product quality; Restrictions, continuous production cannot be carried out, and production efficiency is low

Method used

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  • Device and method for continuously synthesizing poly (propylene carbonate) polyols
  • Device and method for continuously synthesizing poly (propylene carbonate) polyols

Examples

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Embodiment 1

[0043] The present embodiment provides a kind of device of continuous synthesis polypropylene carbonate polyol, such as figure 1 As shown, the device comprises a dual-stage jet reactor J1 and a scraped thin film evaporator T2;

[0044] Wherein, the upper part of the two-stage jet reactor J1 is provided with liquid-phase material inlets respectively connected to the propylene oxide and catalyst storage tank V1 and the molecular weight regulator storage tank V2, and the bottom is provided with a gas-phase raw material inlet;

[0045] The two-stage jet reactor J1 is also provided with an exhaust port on the upper part and a liquid phase product output port on the bottom. The exhaust port is connected to the gas-liquid separator T1 through a gas delivery pipeline, and the liquid phase product output port is connected through a pipeline. To the feed port of the scraped film evaporator T2; the bottom of the scraped film evaporator T2 is connected to the polypropylene carbonate polyo...

Embodiment 2

[0050] This embodiment provides a method for continuously synthesizing polypropylene carbonate polyols using the device described in Example 1. The synthesis process of polypropylene carbonate polyols is as follows figure 1 Shown:

[0051] (1) Mix propylene oxide (PO) with catalyst, store in propylene oxide and catalyst storage tank V1, and keep stirring; add molecular weight regulator R(OH) f Stored in Molecular Weight Regulator Storage Tank V2. After starting up, the two storage tanks output raw materials at a certain ratio, and are sent to the dual-stage jet reactor J1 from the top by the delivery pump P1 through the pipeline 1. CO 2 The gas is passed into the dual-stage jet reactor J1 from the bottom.

[0052] (2) After a certain amount of raw materials are accumulated in the dual-stage jet reactor J1, the circulation pump P2 is turned on, and the mixed material is sent to the dual-stage jet reactor J1 from the top through the pipeline 2 to form a circulation. At this ...

Embodiment 3

[0057] This embodiment provides a method for continuously synthesizing polypropylene carbonate polyols using the device described in Embodiment 1. Compared with Embodiment 2, the only difference is: in this embodiment, the dual-stage jet reactor is high 16m, inner diameter 0.8m. Molecular weight regulator is glycerol, the mass dosage ratio of propylene oxide and catalyst is 1000:1; The molar dosage ratio of propylene oxide and molecular weight regulator is 8:1; CO 2 The molar dosage is 1 / 4 of that of propylene oxide, the reaction temperature is 60°C, the residence time is 4h, and the yield is 91%. Compared with loop reactors of the same scale, the reaction energy consumption is reduced by 30%.

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Abstract

The invention provides a device and a method for continuously synthesizing poly (propylene carbonate) polyols (PPC). The device comprises a duplex injection reactor and a scraper film evaporator. Circular reaction is carried out with the duplex injection reactor; when the reaction is finished, a liquid phase product is delivered to the scraper film evaporator from the bottom of the duplex injection reactor; vacuuming and heating treatments are carried out, and PPC is collected from the bottom. According to the invention, the duplex injection reactor is applied, such that gas-liquid mass transfer rate is improved, gas-liquid mixing degree is improved, and reaction rate is improved. Also, the invention provides a continuous production process, such that purposes of reducing investment and production energy consumption, improving productivity and conversion rate, realizing continuous production, and improving production efficiency are achieved.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a device and method for continuously synthesizing polypropylene carbonate polyol (PPC). Background technique [0002] Polypropylene carbonate polyols (Poly(propylenecarbonate) polyols, referred to as PPC) is a new type of polyurethane raw material, because its molecule contains a large number of carbonate bonds, the polyurethane material prepared from it as a raw material also has polyether polyurethane Excellent hydrolysis resistance and excellent wear resistance and oil resistance of polyester polyurethane have good market application prospects. [0003] There are two main traditional techniques for synthesizing polypropylene carbonate polyols: a stirred tank reactor as the core and a loop reactor as the core. Among them, the stirred tank reactor is a classic fully mixed tank, and the gas-liquid two-phase contact is made by the agitation of the stirring blade to obtain the pro...

Claims

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Application Information

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IPC IPC(8): C08G64/34
Inventor 周政张志炳许如银何仁可王云鹏郑植
Owner NANJING UNIV
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