CN118142468A - Dispersant alcoholysis reaction device and method - Google Patents

Abstract

The invention discloses a dispersant alcoholysis reaction device, which comprises an alcoholysis kettle; wherein: the alcoholysis kettle is connected with a first circulating pump through a circulating pipeline, alcoholysis liquid circulates in the alcoholysis kettle and the circulating pipeline, and a liquid outlet piece is arranged on the circulating pipeline. The micro-positive pressure of the alcoholysis kettle is overcome by the diaphragm pump, so that the polymer liquid is prevented from overflowing from the liquid outlet piece in the sampling process, and the requirement of safe production is met; and the sample can be stably sampled during sampling, so that the representativeness of the sampled sample is ensured, and the timeliness, the authenticity and the accuracy of the alcoholysis degree of the alcoholysis liquid can be better reflected.

Description

Dispersing agent alcoholysis reaction device and method

Technical Field

The invention relates to an alcoholysis reaction device, in particular to a dispersing agent alcoholysis reaction device and method.

Background

Polyvinyl alcohol (PVA for short) is an important polymer synthetic material with properties between rubber and plastic, which is one of the few industrially synthesized water-soluble polymers that have been found. PVA dispersant is one kind of fine chemical product and is one kind of liquid product produced with vinyl acetate and methanol as main material. It can raise the porosity of polyvinyl chloride and make its grain distribution more uniform, so that it is an important component of polyvinyl chloride suspension polymerization formula in recent years.

In the PVA dispersant production process, sampling observation is one of important methods for controlling the alcoholysis degree of the dispersant. At present, when a sample in an alcoholysis kettle is obtained in the alcoholysis process, the sample is usually directly subjected to manual perforation on the alcoholysis kettle, and then a sampling tube is directly stretched into the alcoholysis kettle for sampling. However, the adoption of the direct hole opening mode easily leads to the overflow of harmful volatile gases in the alcoholysis kettle, and the requirement of safe production is not met. The Chinese patent document CN114166576A discloses a closed sampling device capable of quantitatively sampling, which comprises a product tank filled with liquid and closed, wherein a return pipe and a sampling pipe are arranged on the product tank, the sampling pipe is connected with a sampling pump, the return pipe and the sampling pipe are communicated with the product tank, a bypass pipe, a quantitative pipe and a sampling bottle are connected between the return pipe and the outer end of the sampling pipe, sampling valves are arranged at two ends of the quantitative pipe and are respectively communicated with the return pipe and the sampling pipe, a flow guide pipe is connected between the quantitative pipe and the sampling bottle, and a flow guide valve is arranged on the flow guide pipe; two ends of the bypass pipe are provided with bypass valves and are respectively communicated with the return pipe and the sampling pipe; like this, when needs sample, start the sampling pump, the sampling pump produces outer suction to the liquid in the product jar, and the liquid in the product jar is extracted, is full of liquid in the quantitative pipe after, in the liquid water conservancy diversion to the sample bottle in with the quantitative pipe through the honeycomb duct, whole device and sampling process are airtight form, have also reached the effect of quantitative sample.

This prior art has the following disadvantages: the liquid is easy to be unstable during sampling, and the sampled sample has no smoothness, representativeness and authenticity.

Disclosure of Invention

The invention provides a dispersant alcoholysis reaction device, which comprises an alcoholysis kettle; wherein: the alcoholysis kettle is connected with a first circulating pump through a circulating pipeline, alcoholysis liquid circulates in the alcoholysis kettle and the circulating pipeline, and a liquid outlet piece is arranged on the circulating pipeline.

Preferably, the liquid outlet member is a funnel. The funnel is used as a common experimental instrument and is easy to obtain.

Preferably, the first circulation pump is a diaphragm pump. In the operation process, the diaphragm pump stirs the liquid less to can further guarantee steady sample.

Preferably, the liquid outlet piece is a three-way pipe. In this scheme, after adopting the three-way pipe as out the liquid spare, the top mouth that utilizes the three-way pipe is as the sample connection, can realize the sample operation to the polymerization liquid in polymerization liquid circulation in-process, simple structure.

Preferably, a second circulating pump is further arranged in the circulating pipeline, and the second circulating pump is positioned between the liquid outlet piece and the alcoholysis kettle. In this scheme, utilize the second circulating pump can overcome the micro-positive pressure of alcoholysis cauldron to avoid the polymer liquid to overflow from the top mouth of play liquid spare, realize steady sample.

Preferably, valves are respectively arranged at two ends of the liquid outlet piece in the circulating pipeline. In this scheme, go out the setting of liquid spare both ends valve and can stop the regulation of the circulation transportation in the circulation pipeline and flow, simple structure.

In a second aspect, the present invention provides a dispersant alcoholysis reaction method using a dispersant alcoholysis reaction apparatus, comprising the steps of: alcoholysis step: alcoholysis of the polymerization solution in an alcoholysis kettle;

The circulation steps are as follows: starting a first circulating pump, and circulating and conveying the polymerization liquid through a circulating pipeline;

Sampling: sampling is carried out from the upper opening of the liquid outlet piece.

Preferably, in the circulation step, the conveyance of the circulation line is achieved by means of a diaphragm pump.

The invention has the following beneficial effects:

1. In the prior art, as the alcoholysis reaction is an exothermic reaction, the temperature of a reaction system is slowly increased, a small amount of methanol in alcoholysis liquid volatilizes, and methanol steam forms micro-positive pressure in an alcoholysis kettle, so that polymerization liquid overflows from an upper opening of a liquid outlet piece; the sample can be stably sampled during sampling, so that the representativeness of the sampled sample is ensured, the authenticity of the reaction polymerization liquid is ensured, and the timeliness, the authenticity and the accuracy of the alcoholysis degree of the alcoholysis liquid can be better reflected;

2. the overflow of the polymer liquid in the liquid outlet piece is reduced, and the overflow of the methanol can be reduced, thereby meeting the requirements of occupational hygiene.

Drawings

FIG. 1 is a schematic diagram of a dispersant alcoholysis reaction apparatus and a dispersant alcoholysis reaction method in example 1 of the present invention;

FIG. 2 is a schematic diagram of the apparatus for the alcoholysis reaction of a dispersant of example 2;

FIG. 3 is a schematic diagram of the apparatus for the alcoholysis reaction of a dispersant in example 3.

Detailed Description

The following is a further detailed description of the embodiments:

1. Definition of the definition

Pipeline: refers to a conduit coupled to a pump, valve, or control system, etc., for delivering a liquid, gas, or pulverized solid.

Diaphragm pump: the novel circulating pump using compressed air as a power source has the advantages of absorbing various corrosive liquids, liquids with particles, high-viscosity, volatile, inflammable and extremely toxic liquids.

Alcoholysis kettle: the reaction kettle is widely understood to be a container for physical or chemical reaction, and the heating, evaporating and cooling and low-speed and high-speed mixing functions required by the process are realized through structural design and parameter configuration of the container.

2. Reference numerals in the drawings of the specification include: the alcoholysis kettle 1, a first circulating pump 2, a circulating pipeline 10, a liquid outlet piece 3, a valve 4 and a second circulating pump 5.

An example is substantially as shown in figure 1: a dispersant alcoholysis reaction device comprises an alcoholysis kettle 1.

The alcoholysis kettle 1 is connected with a first circulating pump 2 through a circulating pipeline 10, alcoholysis liquid circulates in the alcoholysis kettle 1 and the circulating pipeline, the circulating pipeline 10 is directly connected into the alcoholysis kettle 1, and a liquid outlet piece 3 is arranged on the circulating pipeline 10. The liquid outlet piece 3 is a funnel, and the first circulating pump 2 adopts a diaphragm pump.

Based on the above-mentioned dispersant alcoholysis reaction device, the embodiment also discloses a dispersant alcoholysis reaction method, which comprises the following steps: alcoholysis step: alcoholysis of the polymerization solution in an alcoholysis kettle 1;

The circulation steps are as follows: starting the first circulating pump 2, and circulating and conveying the polymerization liquid through the circulating pipeline 10;

Sampling: sampling was performed from the upper port of the liquid outlet member 3.

Example 2

Unlike the embodiment 1, as shown in fig. 2, in the present embodiment, the liquid outlet member 3 is a three-way pipe, and in the circulation pipeline 10, valves 4 are respectively provided at two ends of the liquid outlet member 3 in the circulation pipeline 10. In this embodiment, when the polymerization liquid circulates, the valves 4 on the circulation line 10 are opened, the first circulation pump 2 is started, the polymerization liquid circulates through the circulation line 10, and the polymerization liquid is sampled from above the liquid outlet.

Example 3

Unlike example 2, as shown in fig. 3, a second circulation pump 5 is further provided in this example, and the second circulation pump 5 is located between the liquid outlet 3 and the alcoholysis tank 1.

The foregoing is merely an embodiment of the present application, and a specific structure and characteristics of common knowledge in the art, which are well known in the scheme, are not described herein, so that a person of ordinary skill in the art knows all the prior art in the application date or before the priority date, can know all the prior art in the field, and has the capability of applying the conventional experimental means before the date, and a person of ordinary skill in the art can complete and implement the present embodiment in combination with his own capability in the light of the present application, and some typical known structures or known methods should not be an obstacle for a person of ordinary skill in the art to implement the present application. It should be noted that modifications and improvements can be made by those skilled in the art without departing from the structure of the present application, and these should also be considered as the scope of the present application, which does not affect the effect of the implementation of the present application and the utility of the patent. The protection scope of the present application is subject to the content of the claims, and the description of the specific embodiments and the like in the specification can be used for explaining the content of the claims.

Claims (8)

1. A dispersant alcoholysis reaction device comprises an alcoholysis kettle; the method is characterized in that: the alcoholysis kettle is connected with a first circulating pump through a circulating pipeline, alcoholysis liquid circulates in the alcoholysis kettle and the circulating pipeline, and a liquid outlet piece is arranged on the circulating pipeline.

2. The dispersant alcoholysis reaction device according to claim 1, characterized in that: the liquid outlet piece is a funnel.

3. The dispersant alcoholysis reaction device according to claim 1, characterized in that: the first circulating pump is a diaphragm pump.

4. A dispersant alcoholysis reaction device according to claim 3 wherein: the liquid outlet piece is a three-way pipe.

5. The dispersant alcoholysis reaction device according to claim 4, characterized in that: the circulating pipeline is also provided with a second circulating pump, and the second circulating pump is positioned between the liquid outlet piece and the alcoholysis kettle.

6. The dispersant alcoholysis reaction apparatus according to claim 4 or 5, characterized in that: valves are respectively arranged at two ends of the liquid outlet piece in the circulating pipeline.

7. A dispersant alcoholysis reaction method using the dispersant alcoholysis reaction apparatus as in any one of claims 1 to 6, characterized in that: the method comprises the following steps: alcoholysis step: alcoholysis of the polymerization solution in an alcoholysis kettle;

The circulation steps are as follows: starting a first circulating pump, and circulating and conveying the polymerization liquid through a circulating pipeline;

Sampling: sampling is carried out from the upper opening of the liquid outlet piece.

8. The dispersant alcoholysis reaction method according to claim 7 characterized in that: in the circulating step, a diaphragm pump is utilized to realize the conveying of a circulating pipeline.