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Polymethyl methacrylate production device and process

A technology of polymethyl methacrylate and production equipment, applied in the direction of control/regulation process, chemical instruments and methods, steam condensation, etc., can solve problems such as gel effect, aggravate side reactions, reduce energy utilization rate, etc., and achieve reduction The effect of energy consumption and simplification of process equipment

Pending Publication Date: 2021-04-30
拓烯科技(衢州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the tank reactor has the following disadvantages: first, the polymerization reaction is carried out in the reactor, and unreacted monomers and some oligomer impurities cannot be removed in time during the reaction; second, the polymerization of PMMA is an exothermic reaction, A large amount of heat is released during the polymerization process, but it is difficult to remove the heat from the kettle reactor, and the exothermic reaction is not easy to control, resulting in a continuous rise in the temperature of the reaction system, an acceleration of the reaction rate, an increase in the viscosity of the reaction system, and the occurrence of a gel effect. The increase will also aggravate side reactions, resulting in more impurities such as dimers, which not only destroys the stable reaction system, but also increases the burden on post-processing equipment and reduces energy utilization.

Method used

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  • Polymethyl methacrylate production device and process
  • Polymethyl methacrylate production device and process
  • Polymethyl methacrylate production device and process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] (1) The monomer of main monomer and copolymer is constantly sent in the reflux tank 3, the first flow regulating valve 131 and the fourth flow regulating valve 321 are opened, the control monomer flow rate is 1550kg / h, and the control initiator flow rate is 0.71kg / h, the initiator and the reaction monomer are mixed and sent into the tower reactor 1 through the first feed port 112, and start polymerization in the first reaction zone 10b;

[0058] (2) When the conversion rate reaches 30-40%, open the fifth flow regulating valve 331, control the monomer flow rate to be 1200kg / h, and send the reaction monomer into the tower reactor 1 through the second feed port 113, mixed with the reaction solution initially polymerized in the first reaction zone 10b, and then repolymerized in the second reaction zone 10c;

[0059] (3) When the conversion rate reaches 60-80%, open the second flow regulating valve 141, control the chain transfer agent flow rate to be 2.0kg / h, and the chain ...

Embodiment 2

[0068] The difference with embodiment 1 is:

[0069] In the step (1), the control monomer flow rate is 1200kg / h, and the control initiator flow rate is 0.5kg / h;

[0070] In step (2), control monomer flow rate is 1600kg / h;

[0071] Control chain transfer agent flow rate is 4.0kg / h in the step (3);

[0072] In step (4), the monomer flow rate is controlled to be 600 kg / h, and the chain transfer agent flow rate is controlled to be 2.0 kg / h.

[0073] Other conditions are consistent with Example 1.

[0074] The output of the finished product of this embodiment is 2060 kg per hour, and 1670 kg of monomer is recovered. A small amount of impurities are discharged through the side line extraction port 117 of the tower body 11. The finished product is clear and transparent colloidal particles, and its physical properties are detected as shown in Table 3 below:

[0075] table 3:

[0076]

Embodiment 3

[0078] The difference with embodiment 1 is:

[0079] In the step (1), the control monomer flow rate is 1000kg / h, and the control initiator flow rate is 0.4kg / h;

[0080] In step (2), control monomer flow rate is 800kg / h;

[0081] Control chain transfer agent flow rate is 4.5kg / h in the step (3);

[0082] In step (4), the monomer flow rate is controlled to be 1500kg / h, and the chain transfer agent flow rate is controlled to be 1.5kg / h.

[0083] Other conditions are consistent with Example 1.

[0084] The output of the finished product of this embodiment is 2055 kg per hour, and 1675 kg of monomer is recovered. A small amount of impurities are discharged through the side line extraction port 117 of the tower body 11. The finished product is clear and transparent colloidal particles, and its physical properties are detected as shown in Table 4 below:

[0085] Table 4:

[0086]

[0087] The present invention adopts the tower reactor to replace the form of multi-stage fully ...

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Abstract

The invention discloses a polymethyl methacrylate production device, which comprises a tower type reactor, a condenser and a return tank; the side line inlet of the tower type reactor comprises three feed ports which are arranged at intervals from top to bottom, each feed port is respectively communicated with an additive feeding pipeline, and a gas phase inlet of the condenser is communicated with a gas phase outlet of the tower type reactor; the reflux tank is provided with a first liquid phase inlet communicated with a liquid phase outlet of the condenser, a second liquid phase inlet for feeding reaction monomers, a first liquid phase outlet for discharging heavy components, and a second liquid phase outlet for discharging light components, wherein the first liquid phase outlet is communicated with a reflux inlet of the tower reactor and each feeding hole. The invention further discloses a polymethyl methacrylate production process applying the polymethyl methacrylate production device. Compared with the prior art, the polymethyl methacrylate production device is low in energy consumption, and the prepared product is good in optical performance.

Description

technical field [0001] The invention relates to the technical field of polymer preparation, in particular to a polymethyl methacrylate production device and process. Background technique [0002] Polymethyl methacrylate (PMMA) is a copolymer formed by copolymerizing methyl methacrylate (MMA) as the main body and a small amount of acrylate monomer. It has good light transmission, electrical insulation, acid and alkali resistance and heat and cold resistance. It has a very wide range of applications in the field of optical materials and daily use, and can be applied to liquid crystal light guide plate films, optical fiber materials, LED materials, etc. [0003] For the optical properties of PMMA, the molecular weight distribution is a very important parameter. The smaller the molecular weight distribution index, the less the transmission loss of light in PMMA, and the better the light transmission performance of PMMA. Free radical polymerization is mostly used in the current...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J19/18B01J19/00B01D5/00C08F220/14
CPCB01J19/18B01J19/0053B01J19/0066B01D5/0006B01J19/0006C08F220/14B01J2219/00164
Inventor 徐小武
Owner 拓烯科技(衢州)有限公司
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