Polyacrylamide preparation system and preparation process

Abstract

The polyacrylamide preparation system comprises a batching tank, a first supergravity reactor, a deoxidation tank, a second supergravity reactor, a polymerization kettle, an initiator storage tank and an auxiliary storage tank, and the batching tank, the first supergravity reactor, the deoxidation tank, the second supergravity reactor and the polymerization kettle are sequentially connected and communicated; and the initiator storage tank and the assistant storage tank are respectively connected and communicated with the mixing pipeline between the deoxidation tank and the second supergravity reactor. The first supergravity reactor and the second supergravity reactor can realize full deoxidation of the AM solution, and the initiator and the deoxidized AM solution are proportionally mixed and then subjected to enhanced mass transfer and efficient reaction, so that the quality and the efficiency are greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of production of polyacrylamides with various molecular weights, and more particularly to a polyacrylamide preparation system and process. Background Art

[0002] Currently, polyacrylamide (PAM) preparation systems typically use tank or kettle reactors. In the batching kettle, the raw materials are accurately weighed and mixed according to the designed formula. Specifically, acrylamide monomer (hereinafter referred to as AM) and other required monomers are dissolved in water, and appropriate amounts of initiators and other additives are added. The ingredients are then added to the polymerization kettle. By controlling conditions such as temperature, pressure, stirring speed, and reaction time, the raw materials undergo a polymerization reaction to produce PAM colloid.

[0003] However, there are the following defects: the quality is unstable, the molecular weight distribution is relatively wide, the discreteness is large, and the polymerization reaction time is long, generally more than 6-7 hours, the production efficiency is low, and the cost is high.

[0004] Therefore, providing a polyacrylamide preparation system and preparation process is an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the present invention provides a polyacrylamide preparation system and preparation process, which can effectively improve the quality and production efficiency of PAM.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A polyacrylamide preparation system comprises a batching tank, a first high-gravity reactor, a deoxidation tank, a second high-gravity reactor, a polymerization kettle, an initiator storage tank and an auxiliary agent storage tank, wherein the batching tank, the first high-gravity reactor, the deoxidation tank, the second high-gravity reactor and the polymerization kettle are sequentially connected and communicated with each other; the initiator storage tank and the auxiliary agent storage tank are respectively connected and communicated with a mixing pipe between the deoxidation tank and the second high-gravity reactor.

[0008] By adopting the above technical solution, the beneficial effects of the present invention are:

[0009] The first high-gravity reactor and the second high-gravity reactor can achieve full deoxygenation of the AM solution, and after the initiator is mixed with the deoxygenated AM solution in a certain proportion, enhance mass transfer and achieve efficient reaction, which greatly improves the quality and efficiency.

[0010] A polyacrylamide preparation process is carried out using the above polyacrylamide preparation system, comprising the following steps:

[0011] 1) Add acrylamide monomer, additives and water in proportion to a mixing tank and stir and mix until uniformly mixed;

[0012] 2) transporting the acrylamide monomer solution to a first high-gravity reactor for deoxygenation, and then collecting it into a deoxygenation tank;

[0013] 3) The initiator and the auxiliary agent are continuously delivered to the mixing pipe in proportion to mix with the deoxygenated acrylamide monomer solution, and then enter the second high gravity reactor for sufficient mixing, and finally enter the polymerization kettle. After the polymerization is completed, a qualified polyacrylamide colloid is obtained.

[0014] Furthermore, before step 2), the polyacrylamide preparation system is purged with nitrogen.

[0015] Furthermore, the nitrogen purge time was 5 minutes.

[0016] Further, in step 2), the acrylamide monomer solution is pumped at a pressure of 1-156 ml by a pump or nitrogen. 3 / h is transported to the first high gravity reactor.

[0017] Further, in step 3), the mixed solution is 1-156m 3 / h is delivered to the second high gravity reactor.

[0018] It can be seen from this that the present invention provides a polyacrylamide preparation system and preparation process. Compared with the existing technology, the present invention has advantages in terms of PAM quality, preparation efficiency and cost, and has very broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0020] Figure 1 The accompanying drawing is a flow chart of a polyacrylamide preparation system provided by the present invention. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] like Figure 1 As shown, an embodiment of the present invention discloses a polyacrylamide preparation system, comprising a batching tank 1, a first high-gravity reactor 2, a deoxygenation tank 3, a second high-gravity reactor 4, a polymerization kettle 5, an initiator storage tank 6, and an auxiliary agent storage tank 7. The batching tank 1, the first high-gravity reactor 2, the deoxygenation tank 3, the second high-gravity reactor 4, and the polymerization kettle 5 are sequentially connected and communicated with each other; the initiator storage tank 6 and the auxiliary agent storage tank 7 are respectively connected to the mixing pipe between the deoxygenation tank 3 and the second high-gravity reactor 4. The first high-gravity reactor 2 of the present invention deoxygenates the AM aqueous solution, reducing the oxygen content in the AM aqueous solution to less than 0.2 ppm, far below the 3 ppm requirement stipulated in conventional production. The second high-gravity reactor 4 ensures that the initiator, auxiliary agent, and AM solution are fully and uniformly mixed and reacted at the micrometer level, enhancing mass transfer and mixing, improving reaction efficiency, and greatly improving quality.

[0023] The present invention also discloses a polyacrylamide preparation process, which is carried out using the above polyacrylamide preparation system and includes the following steps:

[0024] 1) Add acrylamide monomer, additives and water in proportion to the mixing tank 1 and stir and mix until uniformly mixed;

[0025] 2) Use a pump or nitrogen to pump the acrylamide monomer solution at a pressure of 1-156 ml. 3 / h flow rate is transported to the first high gravity reactor 2 for deoxygenation, and then flows into the deoxygenation tank 3;

[0026] 3) The initiator and the auxiliary agent are continuously delivered to the mixing pipe in proportion to mix with the deoxygenated acrylamide monomer solution, and then the mixed solution is heated at 1-156m 3 / h flow rate is transported to the second high gravity reactor 4 for sufficient mixing, and finally enters the polymerization kettle 5. After 2 hours of polymerization, qualified polyacrylamide colloid is obtained.

[0027] In order to further optimize the technical solution of the present invention, before step 2), the polyacrylamide preparation system is purged with nitrogen. In this embodiment, the nitrogen purge time is 5 minutes.

[0028] Tests have shown that during multiple production runs of 25 million high-molecular-weight PAM, the molecular weight consistently met specifications, with variations of no more than 4%, exceeding the standards for similar products. The key filtration ratio was lower than the national standard of 1.5 for first-grade products, with several batches even approaching the theoretical value of 1. The polymerization time was less than 2.5 hours, more than half the conventional time, significantly improving efficiency. Furthermore, the improved deoxygenation effect shortened the nitrogen blanketing time and significantly reduced high-purity nitrogen consumption, further reducing costs.

[0029] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Reference can be made to the common and similar parts between the various embodiments. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the method description.

[0030] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A polyacrylamide preparation system, characterized in that: It includes a batching tank, a first high-gravity reactor, a deoxidation tank, a second high-gravity reactor, a polymerization kettle, an initiator storage tank and an auxiliary agent storage tank. The batching tank, the first high-gravity reactor, the deoxidation tank, the second high-gravity reactor and the polymerization kettle are connected to each other in sequence; the initiator storage tank and the auxiliary agent storage tank are respectively connected to the mixing pipe between the deoxidation tank and the second high-gravity reactor.

2. A polyacrylamide preparation process, carried out using the polyacrylamide preparation system according to claim 1, characterized in that: The following steps are involved: 1) Add acrylamide monomer, additives and water in proportion to a mixing tank and stir and mix until uniformly mixed; 2) transporting the acrylamide monomer solution to a first high-gravity reactor for deoxygenation, and then collecting it into a deoxygenation tank; 3) The initiator and the auxiliary agent are continuously delivered to the mixing pipe in proportion to mix with the deoxygenated acrylamide monomer solution, and then enter the second high gravity reactor for sufficient mixing, and finally enter the polymerization kettle. After the polymerization is completed, a qualified polyacrylamide colloid is obtained.

3. A polyacrylamide preparation process according to claim 2, characterized in that, Before step 2), the polyacrylamide preparation system is purged with nitrogen.

4. A polyacrylamide preparation process according to claim 3, characterized in that: The nitrogen purge time was 5 minutes.

5. A polyacrylamide preparation process according to claim 2, characterized in that, In step 2), the acrylamide monomer solution is pumped at a pressure of 1-156 ml by a pump or nitrogen. 3 / h is delivered to the first high gravity reactor.

6. A polyacrylamide preparation process according to claim 2, characterized in that, In step 3), the mixed solution is 1-156m 3 / h is delivered to the second high gravity reactor.

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