CN215480663U

CN215480663U - Pipeline type device for continuously producing thiopropionate series compounds

Info

Publication number: CN215480663U
Application number: CN202121836941.0U
Authority: CN
Inventors: 袁沩明; 潘锦; 张玉华; 范明磊; 杨忠义; 张满中
Original assignee: Tangshan Jinshuo Chemical Co Ltd
Current assignee: Tangshan Jinshuo Chemical Co Ltd
Priority date: 2021-08-06
Filing date: 2021-08-06
Publication date: 2022-01-11
Anticipated expiration: 2031-08-06

Abstract

The utility model discloses a pipeline type device for continuously producing thiopropionate series compounds, which can simultaneously or respectively prepare thiodipropionate compounds, dithiodipropionate compounds and mercapto ester compounds. The method has the advantages of simple operation, low cost and high yield, and is suitable for industrial production.

Description

Pipeline type device for continuously producing thiopropionate series compounds

Technical Field

The utility model relates to a device for continuously producing thiopropionate series compounds in a pipeline mode, and belongs to the field of compound preparation process design.

Background

Continuous production is an important production mode, and compared with intermittent production, the continuous production is favored by factories due to the advantages of high efficiency, stable product quality, high energy utilization rate, high automation level, low labor intensity and the like. The pipeline reactor belongs to one kind of continuous production, has the advantages of high capacity, high heat effect, less back mixing and other advantages, and is suitable for industrial production. At present, the production mode for preparing the thiopropionate is multi-kettle parallel intermittent production, and the method has low efficiency, low automation level and high labor intensity and is not beneficial to industrial production.

Disclosure of Invention

In order to overcome the problems in the prior art, the utility model provides a method and a device for continuously producing thiopropionate series compounds in a pipeline way, which have the characteristics of high efficiency, high capacity, high automation degree and easy industrial production.

In order to achieve the purpose, the utility model adopts the following technical means:

the utility model provides a method for continuously producing thiopropionate series compounds in a pipeline way, which can simultaneously or respectively prepare thiodipropionate compounds, dithiodipropionate compounds and mercapto ester compounds, and comprises the following steps:

(1) fully mixing a mixed solution a of sulfur and an ammonia water solution with alkyl acrylate, adding the mixed solution a into a reactor, introducing hydrogen sulfide gas, reacting, and separating to obtain mixed ester and waste liquid a;

(2) if a thiodipropionate compound needs to be prepared, directly separating and purifying the mixed ester obtained in the step (1) to obtain a thiodipropionate compound product; if the dithiodipropionate compound or the mercapto ester compound needs to be prepared, carrying out the step (3);

(3) adding the sodium sulfite solid into the stirred ammonia water solution, fully mixing to obtain a mixed solution b, fully mixing the mixed solution b with the mixed ester obtained in the step (1), introducing the mixed solution b into a reactor, introducing hydrogen sulfide, reacting, and separating to obtain intermediate ester and waste liquid b;

(4) if a dithiodipropionate compound needs to be prepared, directly separating and purifying the intermediate ester obtained in the step (3) to obtain a dithiodipropionate compound product; if the mercapto ester compound is required to be prepared, carrying out the step (5);

(5) adding the sodium sulfite solid into the stirred ammonia water solution, fully mixing to obtain a mixed solution c, fully mixing the mixed solution c with the intermediate ester obtained in the step (3), introducing the mixed solution c into a reactor, introducing hydrogen sulfide, reacting, and separating to obtain semi-refined ester and waste liquid c;

(6) and (5) separating and purifying the semi-refined ester obtained in the step (5) to obtain a mercapto ester compound product.

Further, the alkyl group in the alkyl acrylate is an alkyl group having 1 to 8 carbon atoms, including but not limited to-CH₃、-C₂H₅、-C₃H₇、-C₄H₉、-C₅H₁₁、-C₆H₁₃、-C₇H₁₅、-C₈H₁₇。

Further, in the step (1), the concentration of the aqueous ammonia solution is 0.1 wt% to 25 wt%.

Further, in the step (1), the mass ratio of the ammonia water solution to the sulfur is 1:0 to 1:0.7, and the adjustment is carried out according to the product to be prepared, and if only the thiodipropionate compound is required to be prepared, the sulfur is not required to be added.

Further, in the step (1), the mass ratio of the aqueous ammonia solution to the alkyl acrylate is between 1:0.1 and 1: 10.

Further, in the step (1), the hydrogen sulfide is used as a pressurizing gas, and the pressure of the reaction is maintained to be more than 0.1MPa and not more than 1 MPa.

Further, in step (1), the temperature of the reaction is 10 ℃ to 70 ℃.

Further, in the step (1), the reaction time is 20min to 40 min.

Further, in the step (3), the concentration of the aqueous ammonia solution is 0.1 wt% to 25 wt%.

Further, in the step (3), the mass fraction of the sodium sulfite in the mixed solution b is 10% to 45%.

Further, in the step (3), the mass ratio of the mixed ester to the sodium sulfite is between 1:0.1 and 1:0.77, and the amount of the sodium sulfite is adjusted according to the content of the mixed ester.

Further, in the step (3), the hydrogen sulfide is used as a pressurizing gas, the pressure of the reaction is kept at 0-1MPa, and the pressure is adjusted according to the product to be prepared, and if only the dithiodipropionate compound needs to be prepared, the hydrogen sulfide does not need to be introduced.

Further, in step (3), the temperature of the reaction is 40 ℃ to 85 ℃.

Further, in the step (3), the reaction time is 30min to 40 min.

Further, in the step (5), the concentration of the aqueous ammonia solution is 0.1 wt% to 25 wt%.

Further, in the step (5), the mass fraction of the sodium sulfite in the mixed solution c is 10% to 45%.

Further, in the step (5), the mass ratio of the intermediate ester to the sodium sulfite is between 1:0.1 and 1:0.5, and the amount of the sodium sulfite is adjusted according to the content of the mixed ester.

Further, in the step (5), the hydrogen sulfide is used as a pressurizing gas, and the pressure of the reaction is maintained to be more than 0.1MPa and not more than 1 MPa.

Further, in the step (5), the temperature of the reaction is 40 ℃ to 85 ℃.

Further, in the step (5), the time of the reaction is 30 min.

To implement the above method, accordingly, the present invention also provides an apparatus for continuously producing thiopropionate series compounds in a pipeline manner, the apparatus comprising apparatuses for respectively preparing thiodipropionate ester compounds, dithiodipropionate ester compounds and mercapto ester compounds:

the device for preparing the thiodipropionate compound comprises a premixing tank 1, a pipeline type reactor 1, a buffer tank 1 and a separator 1 which are sequentially connected through a pipeline;

the device for preparing the dithiodipropionate compound comprises a premixing tank 2, a pipeline type reactor 2, a buffer tank 2 and a separator 2 which are sequentially connected through pipelines;

the device for preparing the mercapto-ester compounds comprises a premixing tank 3, a pipeline type reactor 3, a buffer tank 3 and a separator 3 which are sequentially connected through pipelines;

wherein:

the pipeline type reactor 1, the pipeline type reactor 2 and the pipeline type reactor 3 are respectively connected with a hydrogen sulfide gas pipeline; the separator 1, the separator 2 and the separator 3 are respectively connected with the same fractionating tower through pipelines with gates; the separator 1, the separator 2 and the separator 3 are also respectively connected with a waste liquid receiving device through pipelines; the separator 1 is also connected with the premixing tank 2 through a pipeline with a gate, and the separator 2 is also connected with the premixing tank 3 through a pipeline with a gate; the buffer tank 1, the buffer tank 2 and the buffer tank 3 are respectively connected with the tail gas absorption device through pipelines.

Furthermore, a static mixer is respectively arranged in each pipeline of the pipeline type reactor every 6.3 m.

Further, each of the pipe-type reactors has an inner diameter of 10mm to 100mm, preferably 50 mm.

Furthermore, the material of each pipeline reactor is stainless steel 316L.

Further, each of the pipe reactors had a length of 1500 m.

Compared with the prior art, the utility model has the following advantages:

the utility model has high automation degree and low labor intensity.

Secondly, the utility model has large capacity and high efficiency and is easy for industrialized production.

Drawings

FIG. 1 is a process flow diagram of the present invention for the pipeline-type continuous production of thiopropionate compounds and the apparatus therefor;

FIG. 2 is a chromatogram of a methyl mercaptopropionate standard;

FIG. 3 is a chromatogram of the methyl mercaptopropionate product prepared in example 3 of the present invention;

FIG. 4 is a chromatogram of a 3.3' -dimethylthiodipropionate standard;

FIG. 5 is a chromatogram of the dimethyl 3.3' -thiodipropionate product prepared in example 4 of the present invention;

FIG. 6 is a chromatogram of a 3, 3' -dithiodipropionic acid dimethyl ester standard;

FIG. 7 is a chromatogram of the dimethyl 3, 3' -dithiodipropionate product prepared in example 5 of the present invention;

FIG. 8 is a chromatogram of an ethyl mercaptopropionate standard;

FIG. 9 is a chromatogram of the ethyl mercaptopropionate product prepared in example 6 of the present invention;

FIG. 10 is a chromatogram of a 3.3' -thiodipropionic acid diethyl ester standard;

FIG. 11 is a chromatogram of the diethyl 3.3' -thiodipropionate product prepared in example 7 according to the present invention;

FIG. 12 is a chromatogram of a 3, 3' -dithiodipropionic acid diethyl ester standard;

FIG. 13 is a chromatogram of the diethyl 3, 3' -dithiodipropionate product prepared in example 8 according to the present invention;

FIG. 14 is a chromatogram of a butyl mercaptopropionate standard;

FIG. 15 is a chromatogram of the butyl mercaptopropionate product prepared in example 9 of the present invention;

FIG. 16 is a chromatogram of a 3.3' -dibutyl thiodipropionate standard;

FIG. 17 chromatogram of dibutyl 3.3' -thiodipropionate product obtained in example 10 according to the present invention;

FIG. 18 is a chromatogram of a dibutyl 3, 3' -dithiodipropionate standard;

FIG. 19 is a chromatogram of dibutyl 3, 3' -dithiodipropionate product prepared in example 11 according to the present invention.

Detailed Description

The utility model will be further described with reference to specific embodiments, and the advantages and features of the utility model will become apparent as the description proceeds. These examples are illustrative only and do not limit the scope of the present invention in any way. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the utility model, and that such changes and modifications may be made without departing from the spirit and scope of the utility model.

Example 1 apparatus for continuously producing thiopropionate series compound in pipeline manner according to the present invention

The process flow diagram of the method for continuously producing the thiopropionate series compound in a pipeline way and the device thereof is shown in figure 1.

The apparatus of this embodiment includes apparatuses for preparing thiodipropionate ester compounds, dithiodipropionate ester compounds, and mercapto ester compounds, respectively, and can simultaneously or separately prepare thiodipropionate ester compounds, dithiodipropionate ester compounds, and mercapto ester compounds:

wherein:

Further, each of the pipe reactors had an inner diameter of 50 mm.

Furthermore, the material of each pipeline reactor is stainless steel 316L.

Further, each of the pipe reactors had a length of 1500 m.

Example 2 Process for producing thiopropionate series Compounds Using the apparatus of the present invention

The method of this embodiment can prepare the thiodipropionate ester compound, the dithiodipropionate ester compound and the mercapto ester compound simultaneously or separately, and comprises the following steps:

(1) adding a mixed solution a of sulfur and an ammonia water solution and alkyl acrylate into a premixing tank 1, fully mixing, introducing into a pipeline type reactor 1, introducing hydrogen sulfide gas, reacting, obtaining mixed ester and a waste liquid a through a buffer tank 1 and a separator 1, sending waste gas generated in the buffer tank 1 into a tail gas absorption device, and sending the waste liquid a into a waste liquid receiving device;

(2) if the thiodipropionate compound needs to be prepared, closing a valve between the separator 1 and the premixing tank 2, opening a valve between the separator 1 and a fractionating tower, directly introducing the mixed ester obtained in the step (1) into the fractionating tower, and separating and purifying to obtain a thiodipropionate compound product; if the dithiodipropionate compound or the mercapto-ester compound needs to be prepared, opening a valve between the separator 1 and the premixing tank 2, and closing the valve between the separator 1 and the fractionating tower to perform the step (3);

(3) adding a sodium sulfite solid into a stirred ammonia water solution, fully mixing to obtain a mixed solution b, adding the mixed solution b and the mixed ester obtained in the step (1) into a premixing tank 2, fully mixing, introducing into a pipeline type reactor 2, introducing hydrogen sulfide, reacting, passing through a buffer tank 2 and a separator 2 to obtain intermediate ester and a waste liquid b, sending waste gas generated in the buffer tank 2 into a tail gas absorption device, and sending the waste liquid b into a waste liquid receiving device;

(4) if the dithiodipropionate compound needs to be prepared, closing a valve between the separator 2 and the premixing tank 3, opening a valve between the separator 2 and a fractionating tower, directly introducing the intermediate ester obtained in the step (3) into the fractionating tower, and separating and purifying to obtain a dithiodipropionate compound product; if the mercapto-ester compound needs to be prepared, opening a valve between the separator 2 and the premixing tank 3, and closing a valve between the separator 2 and the fractionating tower to perform the step (5);

(5) adding a sodium sulfite solid into a stirred ammonia water solution, fully mixing to obtain a mixed solution c, adding the mixed solution c and the intermediate ester obtained in the step (3) into a premixing tank 3, fully mixing, introducing into a pipeline type reactor 3, introducing hydrogen sulfide, reacting, passing through a buffer tank 3 and a separator 3 to obtain semi-refined ester and a waste liquid c, feeding waste gas generated in the buffer tank 3 into a tail gas absorption device, and feeding the waste liquid c into a waste liquid receiving device;

(6) opening a valve between the separator 3 and a fractionating tower, introducing the semi-refined ester obtained in the step (5) into the fractionating tower, and separating and purifying to obtain a mercapto ester compound product;

example 3 production of methyl mercaptopropionate Using the apparatus and Process of the present invention

(1) Adding sulfur, 5% ammonia water and methyl acrylate into a premixing tank 1 according to the ratio of 1:3.35:3.68, fully mixing, then introducing into a pipeline type reactor 1 with the length of 1500m and a static mixer every 6.3m at the speed of 0.8m/s, simultaneously introducing hydrogen sulfide into the pipeline type reactor 1 at the speed of 8.8kg/min, keeping the temperature of the pipeline type reactor 1 between 35 ℃ and 40 ℃, keeping the pressure at normal pressure, after the mixture is completely removed from the pipeline type reactor 1, respectively obtaining mixed ester and waste liquid a through a buffer tank 1 and a separator 1;

(2) adding sodium sulfite solid, 5% ammonia water and the mixed ester obtained in the step (1) into a premixing tank 2 according to the ratio of 1:1.62:2.47, fully mixing, introducing into a pipeline type reactor 2 with the length of 1500m and a static mixer at the interval of 6.3m at the speed of 0.8m/s, introducing hydrogen sulfide into the pipeline type reactor 2, keeping the internal pressure at about 0.4MPa and the temperature at 50-65 ℃, after the mixture is completely removed from the pipeline type reactor 2, and obtaining intermediate ester and waste liquid b through a buffer tank 2 and a separator 2 respectively;

(3) adding sodium sulfite solid, 5% ammonia water and the intermediate ester obtained in the step (2) into a premixing tank 3 according to the ratio of 1:1.62:2.47, fully mixing, introducing into a pipeline type reactor 3 with the length of 1500m and a static mixer at the interval of 6.3m at the speed of 0.8m/s, introducing hydrogen sulfide into the pipeline type reactor 3, keeping the internal pressure at about 0.4MPa and the temperature at 50-65 ℃, after the mixture is completely removed from the pipeline type reactor 3, and obtaining semi-refined ester through a buffer tank 3 and a separator 3;

(4) and (4) introducing the semi-refined ester obtained in the step (3) into a fractionating tower, and separating and purifying to obtain the methyl mercaptopropionate with the purity of more than 99%.

The chromatogram of the methyl mercaptopropionate standard is shown in FIG. 2, and the chromatogram of the methyl mercaptopropionate product prepared in this example is shown in FIG. 3.

Example 4 production of dimethyl thiodipropionate Using the apparatus and Process of the present invention

(1) Adding 5% ammonia water and methyl acrylate into a premixing tank 1 according to the proportion of 1:0.95, fully mixing, introducing into a pipeline type reactor 1 with the length of 1500m and a static mixer every 6.3m at the speed of 0.8m/s, introducing hydrogen sulfide into the pipeline type reactor at the speed of 8.8kg/min, keeping the temperature of the pipeline type reactor 1 between 35 ℃ and 40 ℃, keeping the pressure at normal pressure, after the mixture is completely removed from the pipeline type reactor 1, and respectively obtaining mixed ester and waste liquid a through a buffer tank 1 and a separator 1;

(2) and (2) introducing the mixed ester obtained in the step (1) into a fractionating tower, and separating and purifying to obtain the dimethyl thiodipropionate with the purity of more than 99%.

The chromatogram of the standard dimethyl thiodipropionate is shown in FIG. 4, and the chromatogram of the dimethyl thiodipropionate product prepared in this example is shown in FIG. 5.

Example 5 production of dimethyl Dithiodipropionate Using the apparatus and Process of the present invention

(2) adding sodium sulfite solid, 10% ammonia water and the mixed ester obtained in the step (1) into a premixing tank 2 according to the ratio of 1:2.56:3.17, fully mixing, introducing into a pipeline type reactor 2 with the length of 1500m and a static mixer at the interval of 6.3m at the speed of 0.8m/s, introducing hydrogen sulfide into the pipeline type reactor 2, keeping the internal pressure at about 0.4MPa and the temperature at 50-65 ℃, after the mixture is completely removed from the pipeline type reactor 2, and obtaining intermediate ester and waste liquid b through a buffer tank 2 and a separator 2 respectively;

(3) and (3) introducing the intermediate ester obtained in the step (2) into a fractionating tower, and separating and purifying to obtain the dimethyl dithiodipropionate with the purity of over 99 percent.

The chromatogram of the standard dimethyldithiodipropionate is shown in FIG. 6, and the chromatogram of the dimethyldithiodipropionate product prepared in this example is shown in FIG. 7.

Example 6 production of Ethyl mercaptopropionate Using the apparatus and method of the present invention

(1) Adding sulfur, 5% ammonia water and ethyl acrylate into a premixing tank 1 according to the ratio of 1:4.03:4.28, fully mixing, then introducing into a pipeline type reactor 1 with the length of 1500m and a static mixer every 6.3m at the speed of 0.8m/s, simultaneously introducing hydrogen sulfide into the pipeline type reactor 1 at the speed of 8.8kg/min, keeping the temperature of the pipeline type reactor 1 between 35 ℃ and 40 ℃, keeping the pressure at normal pressure, after the mixture is completely removed from the pipeline type reactor 1, respectively obtaining mixed ester and waste liquid a through a buffer tank 1 and a separator 1;

(2) adding sodium sulfite solid, 5% ammonia water and the mixed ester obtained in the step (1) into a premixing tank 2 according to the ratio of 1:1.62:2.87, fully mixing, introducing into a pipeline type reactor 2 with the length of 1500m and a static mixer at the interval of 6.3m at the speed of 0.8m/s, introducing hydrogen sulfide into the pipeline type reactor 2, keeping the internal pressure at about 0.4MPa and the temperature at 50-65 ℃, after the mixture is completely removed from the pipeline type reactor 2, and obtaining intermediate ester and waste liquid b through a buffer tank 2 and a separator 2 respectively;

(3) adding sodium sulfite solid, 5% ammonia water and the intermediate ester obtained in the step (2) into a premixing tank 3 according to the ratio of 1:1.62:2.87, fully mixing, introducing into a pipeline type reactor 3 with the length of 1500m and a static mixer at the interval of 6.3m at the speed of 0.8m/s, introducing hydrogen sulfide into the pipeline type reactor 3, keeping the internal pressure at about 0.4MPa and the temperature at 50-65 ℃, after the mixture is completely removed from the pipeline type reactor 3, and obtaining semi-refined ester through a buffer tank 3 and a separator 3;

(4) and (4) introducing the semi-refined ester obtained in the step (3) into a fractionating tower, and separating and purifying to obtain the ethyl mercaptopropionate with the purity of over 99 percent.

The chromatogram of the ethyl mercaptopropionate standard sample is shown in FIG. 8, and the chromatogram of the ethyl mercaptopropionate product prepared in this example is shown in FIG. 9.

Example 7 production of diethyl thiodipropionate Using the apparatus and Process of the present invention

(1) Adding 5% ammonia water and ethyl acrylate into a premixing tank 1 according to the proportion of 1:0.94, fully mixing, introducing into a pipeline type reactor 1 with the length of 1500m and a static mixer every 6.3m at the speed of 0.8m/s, introducing hydrogen sulfide into the pipeline type reactor at the speed of 8.8kg/min, keeping the temperature of the pipeline type reactor 1 between 35 ℃ and 40 ℃, keeping the pressure at normal pressure, after the mixture is completely removed from the pipeline type reactor 1, and respectively obtaining mixed ester and waste liquid a through a buffer tank 1 and a separator 1;

(2) and (2) introducing the mixed ester obtained in the step (1) into a fractionating tower, and separating and purifying to obtain the diethyl thiodipropionate with the purity of more than 99%.

The chromatogram of the diethyl thiodipropionate standard sample is shown in FIG. 10, and the chromatogram of the diethyl thiodipropionate product prepared in this example is shown in FIG. 11.

Example 8 production of Dithiodipropionic acid diethyl ester Using the apparatus and Process of the present invention

(2) adding sodium sulfite solid, 10% ammonia water and the mixed ester obtained in the step (1) into a premixing tank 2 according to the ratio of 1:2.56:3.69, fully mixing, introducing into a pipeline type reactor 2 with the length of 1500m and a static mixer at the interval of 6.3m at the speed of 0.8m/s, introducing hydrogen sulfide into the pipeline type reactor 2, keeping the internal pressure at about 0.4MPa and the temperature at 50-65 ℃, after the mixture is completely removed from the pipeline type reactor 2, and obtaining intermediate ester and waste liquid b through a buffer tank 2 and a separator 2 respectively;

(3) and (3) introducing the intermediate ester obtained in the step (2) into a fractionating tower, and separating and purifying to obtain the diethyl dithiodipropionate with the purity of more than 99%.

The chromatogram of the diethyl dithiodipropionate standard sample is shown in FIG. 12, and the chromatogram of the diethyl dithiodipropionate product prepared in this example is shown in FIG. 13.

Example 9 production of butyl mercaptopropionate Using the apparatus and Process of the present invention

(1) Adding sulfur, 5% ammonia water and butyl acrylate into a premixing tank 1 according to the ratio of 1:5.63:5.48, fully mixing, introducing into a pipeline type reactor 1 with the length of 1500m and a static mixer every 6.3m at the speed of 0.8m/s, simultaneously introducing hydrogen sulfide into the pipeline type reactor 1 at the speed of 8.8kg/min, keeping the temperature of the pipeline type reactor 1 between 40 ℃ and 50 ℃, keeping the pressure at normal pressure, after the mixture is completely removed from the pipeline type reactor 1, respectively obtaining mixed ester and waste liquid a through a buffer tank 1 and a separator 1;

(2) adding sodium sulfite solid, 5% ammonia water and the mixed ester obtained in the step (1) into a premixing tank 2 according to the ratio of 1:1.62:3.67, fully mixing, introducing into a pipeline type reactor 2 with the length of 1500m and a static mixer at the interval of 6.3m at the speed of 0.8m/s, introducing hydrogen sulfide into the pipeline type reactor 2, keeping the internal pressure at about 0.4MPa and the temperature at 50-65 ℃, after the mixture is completely removed from the pipeline type reactor 2, and obtaining intermediate ester and waste liquid b through a buffer tank 2 and a separator 2 respectively;

(3) adding sodium sulfite solid, 5% ammonia water and the intermediate ester obtained in the step (2) into a premixing tank 3 according to the ratio of 1:1.62:3.67, fully mixing, introducing into a pipeline reactor 3 with the length of 1500m and a static mixer at the interval of 6.3m at the speed of 0.8m/s, introducing hydrogen sulfide into the pipeline reactor 3, keeping the internal pressure at about 0.4MPa and the temperature between 50 ℃ and 65 ℃, after the mixture is completely removed from the pipeline reactor 3, obtaining semi-refined ester through a buffer tank 3 and a separator 3;

(4) and (4) introducing the semi-refined ester obtained in the step (3) into a fractionating tower, and separating and purifying to obtain butyl mercaptopropionate with the purity of more than 99%.

The chromatogram of the butyl mercaptopropionate standard sample is shown in FIG. 14, and the chromatogram of the butyl mercaptopropionate product prepared in this example is shown in FIG. 15.

Example 10 production of dibutyl thiodipropionate Using the apparatus and method of the present invention

(1) Adding 5% ammonia water and butyl acrylate into a premixing tank 1 according to the proportion of 1:0.89, fully mixing, introducing into a pipeline type reactor 1 with the length of 1500m and a static mixer every 6.3m at the speed of 0.8m/s, introducing hydrogen sulfide into the pipeline type reactor at the speed of 8.8kg/min, keeping the temperature of the pipeline type reactor 1 between 40 ℃ and 50 ℃, keeping the pressure at normal pressure, after the mixture is completely removed from the pipeline type reactor 1, and respectively obtaining mixed ester and waste liquid a through a buffer tank 1 and a separator 1;

(2) and (2) introducing the mixed ester obtained in the step (1) into a fractionating tower, and separating and purifying to obtain the dibutyl thiodipropionate with the purity of more than 99%.

The chromatogram of the dibutyl thiodipropionate standard is shown in FIG. 16, and the chromatogram of the dibutyl thiodipropionate product prepared in this example is shown in FIG. 17.

Example 11 dibutyl dithiodipropionate production Using the apparatus and method of the present invention

(1) Adding sulfur, 10% ammonia water and butyl acrylate into a premixing tank 1 according to the ratio of 1:5.63:5.48, fully mixing, introducing into a pipeline type reactor 1 with the length of 1500m and a static mixer every 6.3m at the speed of 0.8m/s, simultaneously introducing hydrogen sulfide into the pipeline type reactor 1 at the speed of 8.8kg/min, keeping the temperature of the pipeline type reactor 1 between 40 ℃ and 50 ℃, keeping the pressure at normal pressure, after the mixture is completely removed from the pipeline type reactor 1, respectively obtaining mixed ester and waste liquid a through a buffer tank 1 and a separator 1;

(2) adding sodium sulfite solid, 10% ammonia water and the mixed ester obtained in the step (1) into a premixing tank 2 according to the ratio of 1:2.56:4.72, fully mixing, introducing into a pipeline type reactor 2 with the length of 1500m and a static mixer at the interval of 6.3m at the speed of 0.8m/s, introducing hydrogen sulfide into the pipeline type reactor 2, keeping the internal pressure at about 0.4MPa and the temperature at 50-65 ℃, after the mixture is completely removed from the pipeline type reactor 2, and obtaining intermediate ester and waste liquid b through a buffer tank 2 and a separator 2 respectively;

(3) and (3) introducing the intermediate ester obtained in the step (2) into a fractionating tower, and separating and purifying to obtain the dibutyl dithiodipropionate with the purity of more than 99%.

The chromatogram of the dibutyl dithiodipropionate standard is shown in FIG. 18, and the chromatogram of the dibutyl dithiodipropionate product prepared in this example is shown in FIG. 19.

Claims

1. A device for continuously producing thiopropionate series compounds in a pipeline manner is characterized by comprising devices for preparing thiodipropionate compounds, dithiodipropionate compounds and mercapto ester compounds respectively:

wherein:

2. The apparatus according to claim 1, wherein a static mixer is added to each of the tubular reactors at every 6.3 m.

3. The apparatus according to claim 1, wherein each of the pipe reactors has an inner diameter of 10mm to 100 mm.

4. The apparatus according to claim 3, wherein each of the pipe reactors has an inner diameter of 50 mm.

5. The apparatus of claim 1, wherein each of the pipe reactors is made of stainless steel 316L.

6. The apparatus according to claim 1, wherein each of the pipe reactors has a length of 1500 m.