CN113461845A - PMMA apparatus for producing - Google Patents
PMMA apparatus for producing Download PDFInfo
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- CN113461845A CN113461845A CN202010238542.8A CN202010238542A CN113461845A CN 113461845 A CN113461845 A CN 113461845A CN 202010238542 A CN202010238542 A CN 202010238542A CN 113461845 A CN113461845 A CN 113461845A
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- reactor
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- detection element
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F120/00—Homopolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride, ester, amide, imide or nitrile thereof
- C08F120/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F120/10—Esters
- C08F120/12—Esters of monohydric alcohols or phenols
- C08F120/14—Methyl esters, e.g. methyl (meth)acrylate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/01—Processes of polymerisation characterised by special features of the polymerisation apparatus used
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- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Polymerisation Methods In General (AREA)
Abstract
The invention relates to a PMMA production device which is characterized by comprising a reactor (1), a primary control system (2), a secondary control system (3) and a tertiary control system (4) which are respectively connected with the reactor (1). The PMMA production device can carry out multi-level control on the polymerization reaction in the reactor 1, can carry out accurate and effective control, simultaneously ensures the production operation safety, is more favorable for the drawing-out period stable operation of the PMMA production device compared with the material overheat polymerization, and can effectively improve the quality of PMMA products.
Description
Technical Field
The invention belongs to the technical field of chemical industry, and particularly relates to a PMMA production device.
Background
The production technology of polymethyl methacrylate (PMMA) at home and abroad is mainly based on a solution polymerization method and a bulk method. The solution polymerization method is a common process at home and abroad at present, the system viscosity is moderate, the mass transfer and heat transfer are relatively easy to control, and the problem of sewage treatment is solved. The product is relatively old and is suitable for large-scale continuous production, and is also a main process for producing PMMA molding compound. The bulk polymerization method has the advantages of high product purity, high transparency, high system viscosity, relatively difficult mass and heat transfer control, larger operation difficulty, short flow, pure product, higher molecular weight, no sewage, low energy consumption of post-treatment, and applicability to high-end markets.
Both the two processes are mainstream at home and abroad at present, however, in industrial production, local overheating is caused due to unbalanced mass transfer and heat transfer in a reactor, so implosion occurs to different degrees, and the condition of influencing production still exists, so that stable control on the reaction process is an important work content for ensuring long-period continuous operation of the device.
The traditional PMMA production device has single polymerization reaction control, and generally adopts a mode of mainly adjusting temperature and pressure and feeding amount and an adjusting method of auxiliary jacket heat removal. The temperature and pressure regulation has the defects that after a certain value is exceeded, the regulation system cannot quickly and effectively slow down the implosion phenomenon, the regulation means is limited, and the regulation range is small. The disadvantage of the feed rate adjustment is that when the feed rate is too much, the yield of the device is affected, the subsequent units of the device are greatly affected by low-load operation, and the requirement for system control is high by frequently adjusting the feed rate, so that the product quality is easily adversely affected. The jacket heat removal method is easy to cause larger production wave pairs, the recovery is lagged, and the product purity is influenced.
Disclosure of Invention
The invention aims to solve the problems and provides a PMMA production device, which ensures the stability of the PMMA production process.
In order to achieve the aim, the invention provides a PMMA production device, which comprises a reactor, a primary control system, a secondary control system and a tertiary control system, wherein the primary control system, the secondary control system and the tertiary control system are respectively connected with the reactor.
According to one aspect of the invention, the primary control system comprises a temperature detection element arranged in the reactor, a condenser connected with the reactor, and a regulating valve arranged on the condenser;
and the temperature detection element is connected with the regulating valve to form a temperature regulating system.
According to one aspect of the invention, the condenser is connected with a gas phase pipeline, the primary control system further comprises a pressure detection element arranged at the upper end socket of the reactor, a pressure transmitter connected with the pressure detection element, and a first regulating valve and a second regulating valve which are arranged on the gas phase pipeline;
the detection element, the pressure transmitter, the first regulating valve and the second regulating valve are connected to form a pressure regulating system.
According to one aspect of the invention, the reactor is respectively connected with a feeding pipeline and a discharging pipeline, and the secondary control system comprises a liquid level detection element arranged on the reactor, a gear pump arranged on the discharging pipeline, a flow detection element arranged on the feeding pipeline and a flow regulating valve;
the gear pump is provided with a motor frequency converter, and the liquid level detection element is interlocked with the motor frequency converter of the gear pump to form a liquid level adjusting system.
According to one aspect of the invention, the flow detection element is interlocked with the flow control valve to form a flow control system;
the flow regulating system and the temperature regulating system form cascade regulation.
According to one aspect of the invention, the tertiary control system includes an inhibitor tank connected to the reactor, the inhibitor tank having an inhibitor feed line and a bottoms line connected to the reactor;
the tertiary control system further includes a second level detection element disposed in the inhibitor tank and a third regulator valve disposed in the inhibitor feed line;
and the second liquid level detection element is interlocked with the third regulating valve to form an inhibitor liquid level regulating system.
According to an aspect of the present invention, the tertiary control system further includes a second flow rate detecting element and a self-control valve provided on the bottom line;
the second flow detection element and the self-control valve form an inhibitor flow regulating system.
According to one aspect of the invention, the inhibitor flow regulation system and the temperature regulation system constitute a cascade regulation.
The PMMA production device can carry out multi-level control on the polymerization reaction in the reactor 1, can carry out accurate and effective control, simultaneously ensures the production operation safety, is more favorable for the drawing-out period stable operation of the PMMA production device compared with the material overheat polymerization, and can effectively improve the quality of PMMA products.
Drawings
Fig. 1 schematically shows a structural view of a PMMA production apparatus according to an embodiment of the present invention.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
In describing embodiments of the present invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship that is based on the orientation or positional relationship shown in the associated drawings, which is for convenience and simplicity of description only, and does not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, the above-described terms should not be construed as limiting the present invention.
The present invention is described in detail below with reference to the drawings and the specific embodiments, which are not repeated herein, but the embodiments of the present invention are not limited to the following embodiments.
As shown in FIG. 1, the PMMA production apparatus of the present invention comprises a reactor 1, a primary control system 2, a secondary control system 3 and a tertiary control system 4, which are connected to the reactor 1.
As shown in fig. 1, the primary control system 2 of the present invention includes a temperature detecting element 21 provided in the reactor 1, a condenser 22 connected to the reactor 1, and a regulating valve 23 provided on the condenser 22. The temperature detecting element 21 is connected with the regulating valve 23 to form a temperature regulating system T.
In the present invention, the condenser 22 is connected to a gas phase line 221, and the primary control system 2 further includes a pressure detecting element 11 disposed at an upper head of the reactor 1, a pressure transmitter connected to the pressure detecting element 11, and a first regulating valve 221a and a second regulating valve 221b disposed on the gas phase line 221. The detecting element 11, the pressure transmitter and the first and second regulating valves 221a and 221b are coupled to constitute a pressure regulating system P.
In the invention, the reactor 1 is connected with a feeding pipeline A and a discharging pipeline B respectively, and the two-stage control system 3 comprises a liquid level detection element 31 arranged on the reactor 1, a gear pump 32 arranged on the discharging pipeline B, a flow detection element 33 arranged on the feeding pipeline A and a flow control valve 34. The gear pump 32 is provided with a motor frequency converter, and the liquid level detection element 31 is interlocked with the motor frequency converter of the gear pump 32 to form a liquid level adjusting system L.
In the present invention, the flow detecting element 33 is interlocked with the flow regulating valve 34 to constitute a flow regulating system F, and the flow regulating system F and the temperature regulating system T constitute cascade regulation.
As shown in fig. 1, the three-stage control system 4 of the present invention includes a suppressor tank 41 connected to a reactor 1, the suppressor tank 41 being connected to a suppressor feed line 411 and a bottom line 412, the bottom line 412 being connected to the reactor 1. The three-stage control system 4 further includes a second level detection element 41a provided in the inhibitor tank 41 and a third regulating valve 411a provided in an inhibitor feed line 411. The second level detecting element 41a is interlocked with the third regulating valve 411a, constituting an inhibitor level regulating system L1.
The three-stage control system 4 of the present invention further includes a second flow sensing element 412a and a self-control valve 412 provided on the bottom line 412. The second flow rate detecting element 412a and the self-control valve 412b constitute an inhibitor flow rate adjusting system F2. And the inhibitor flow regulating system F2 and the temperature regulating system T form cascade regulation.
The PMMA production device can effectively control polymerization reaction, in particular, the method for controlling polymerization reaction by the PMMA production device is divided into three-level control.
A first stage: controlled by a primary control system
The condenser 22 is arranged at the top of the reactor 1, the vaporized reaction monomer and solvent in the reactor enter the condenser 22, the condensed condensate returns to the reactor to maintain the reaction temperature, and the condensate amount is controlled by a temperature adjusting system T arranged on a refrigerant pipeline of the condenser. In addition, the pressure regulating system P can regulate the reactor pressure in stages according to the set pressure.
And a second stage: controlled by a secondary control system
Reducing the inventory of material in the reactor 1 allows for a degree of controlled implosion. Mainly by adjusting the opening of the flow control valve 34 and the liquid level in the reactor 1. The mixture entering the reactor 1 can be reduced by means of a flow regulating system F on the feed line a. Meanwhile, the discharge amount of the reactor 1 can be increased through the liquid level adjusting system L, and the material of the reactor 1 is reduced through two sets of adjustment so as to control the temperature in the reactor 1.
And a third stage: controlled by a three-stage control system
I.e. by injection of the inhibitor, or by reaction. The inhibitor can be added automatically by an Rongguo automatic control system, or can be remotely and manually controlled to heat in a control room by stir-frying personnel. Activation of the inhibitor flow regulating system F2 allows control of the amount of inhibitor added to reactor 1 and thus control of the implosion in the reactor.
In the actual operation process, the second-stage control can be crossed, the third-stage control can be directly started, and the second-stage control and the third-stage control can be alternatively controlled or simultaneously controlled.
The PMMA production device can carry out multi-level control on the polymerization reaction in the reactor 1, can carry out accurate and effective control, simultaneously ensures the production operation safety, is more favorable for the drawing-out period stable operation of the PMMA production device compared with the material overheat polymerization, and can effectively improve the quality of PMMA products.
The above description is only one embodiment of the present invention, and is not intended to limit the present invention, and it is apparent to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The PMMA production device is characterized by comprising a reactor (1), a primary control system (2), a secondary control system (3) and a tertiary control system (4), wherein the primary control system, the secondary control system and the tertiary control system are respectively connected with the reactor (1).
2. PMMA production plant according to claim 1, characterized in that the primary control system (2) comprises a temperature detection element (21) arranged in the reactor (1), a condenser (22) connected to the reactor (1), a regulating valve (23) arranged on the condenser (22);
the temperature detection element (21) is connected with the regulating valve (23) to form a temperature regulating system.
3. PMMA production plant according to claim 2, wherein a gas phase line (221) is connected to the condenser (22), the primary control system (2) further comprising a pressure detection element (11) arranged at the upper head of the reactor (1), a pressure transmitter connected to the pressure detection element (11), and a first and a second regulating valve (221a, 221b) arranged on the gas phase line (221);
the detection element (11), the pressure transmitter and the first regulating valve (221a) and the second regulating valve (221b) are connected to form a pressure regulating system.
4. PMMA production plant according to claim 3, characterized in that the reactor (1) is connected with a feed line (A) and a discharge line (B), respectively, the secondary control system (3) comprising a liquid level detection element (31) arranged in the reactor (1), a gear pump (32) arranged in the discharge line (B), a flow detection element (33) arranged in the feed line (A) and a flow control valve (34);
the gear pump (32) is provided with a motor frequency converter, and the liquid level detection element (31) is interlocked with the motor frequency converter of the gear pump (32) to form a liquid level adjusting system.
5. PMMA production plant according to claim 4, characterised in that the flow detection element (33) is interlocked with the flow regulation valve (34) to constitute a flow regulation system;
the flow regulating system and the temperature regulating system form cascade regulation.
6. PMMA production plant according to claim 5, characterized in that the tertiary control system (4) comprises an inhibitor tank (41) connected to the reactor (1), the inhibitor tank (41) being connected to an inhibitor feed line (411) and a bottom line (412), the bottom line (412) being connected to the reactor (1);
the three-level control system (4) further comprises a second level detection element (41a) arranged in the inhibitor tank (41) and a third regulating valve (411a) arranged in the inhibitor feed line (411);
the second liquid level detection element (41a) is interlocked with the third regulating valve (411a) to form an inhibitor liquid level regulating system.
7. PMMA production plant according to claim 6, characterized in that the tertiary control system (4) further comprises a second flow detection element (412a) and a self-control valve (412b) arranged on the bottom line (412);
the second flow detection element (412a) and the automatic control valve (412b) constitute an inhibitor flow regulation system.
8. PMMA production plant according to claim 7, characterized in that the inhibitor flow regulation system and the temperature regulation system constitute a cascade regulation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010238542.8A CN113461845B (en) | 2020-03-30 | 2020-03-30 | PMMA apparatus for producing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010238542.8A CN113461845B (en) | 2020-03-30 | 2020-03-30 | PMMA apparatus for producing |
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| Publication Number | Publication Date |
|---|---|
| CN113461845A true CN113461845A (en) | 2021-10-01 |
| CN113461845B CN113461845B (en) | 2023-03-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010238542.8A Active CN113461845B (en) | 2020-03-30 | 2020-03-30 | PMMA apparatus for producing |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117106131A (en) * | 2023-08-28 | 2023-11-24 | 恒光新材料(江苏)股份有限公司 | Explosion polymerization method for preventing N-phenylmaleimide copolymerization system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117106131A (en) * | 2023-08-28 | 2023-11-24 | 恒光新材料(江苏)股份有限公司 | Explosion polymerization method for preventing N-phenylmaleimide copolymerization system |
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| CN113461845B (en) | 2023-03-31 |
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