Device for improving absorption rate of tetrakis hydroxymethyl phosphonium sulfate

Abstract

The utility model discloses a device for improving the absorption rate of tetrakis hydroxymethyl phosphonium sulfate. A batching kettle is connected with a venturi tube through a flame retardant feed liquid tube; the hydrogen phosphide gas holder is connected with the buffer tank, the buffer tank is connected with the washing kettle, and the washing kettle is connected with the venturi tube through a hydrogen phosphide pipeline; and the venturi tube is connected with the circulating absorption kettle. According to the utility model, a set of venturi tube device is additionally arranged at the upper part of the cyclic synthesis kettle, is connected with the phosphine pipeline and the tetrakis hydroxymethyl phosphonium sulfate pipeline, forms a double-injection state with the previous set of venturi tube equipment, and simultaneously performs cyclic reaction, so that the absorption rate of the tetrakis hydroxymethyl phosphonium sulfate to phosphine gas is greatly improved, the reaction time is shortened, and the production efficiency is improved. The absorption rate of the tetrakis hydroxymethyl phosphonium sulfate feed liquid is greatly improved, so that the yield of the tetrakis hydroxymethyl phosphonium sulfate is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of tetrakis hydroxymethyl phosphonium sulfate production, in particular to a device for improving the absorption rate of tetrakis hydroxymethyl phosphonium sulfate. Background Art

[0002] Tetrakis (hydroxymethyl) phosphonium sulfate, full name Tetrakis (hydroxymethyl) phosphonium sulfate (English abbreviation THPS), is a colorless liquid with molecular formula: [(CH2OH)4P]2SO4 and molecular weight: 406.28. It is a green and environmentally friendly quaternary phosphate fungicide. The product has good water solubility, low freezing point, stable chemical properties, and strong killing performance against bacteria and algae. At the same time, Tetrakis (hydroxymethyl) phosphonium sulfate is also an internationally recognized permanent tetrakis (hydroxymethyl) phosphonium sulfate for pure cotton and polyester-cotton fabrics.

[0003] Tetrakis(hydroxymethyl)phosphonium sulfate mainly puts concentrated sulfuric acid, formaldehyde and water mixture into the circulating kettle in a certain proportion. Phosphine gas is countercurrently contacted and absorbed with the mixed liquid sprayed by the venturi in the circulating kettle to complete the gas phase and liquid phase synthesis reaction to obtain a 40% THPS aqueous solution. The 40% THPS aqueous solution is evaporated to more than 75% of the main content through the II effect, and then filtered, measured and packaged by a fine filter to obtain the product. When the phosphine gas is countercurrently contacted and absorbed with the mixed liquid sprayed by the venturi in the circulating kettle, the absorption rate of the phosphine gas is too low, resulting in excessive phosphine gas and too low production of tetrakis(hydroxymethyl)phosphonium sulfate. Summary of the invention

[0004] The purpose of the utility model is to overcome the above-mentioned shortcomings and provide a device for improving the absorption rate of tetrakis(hydroxymethyl)phosphonium sulfate, which can greatly improve the absorption rate of phosphine gas, shorten the synthesis absorption time, improve production efficiency, and achieve the purpose of increasing output.

[0005] In order to solve the above technical problems, the utility model adopts the following technical scheme: a device for improving the absorption rate of tetrakis hydroxymethyl phosphonium sulfate, adding a set of venturi devices on the upper part of the circulating synthesis reactor, connecting the phosphine pipeline and the tetrakis hydroxymethyl phosphonium sulfate pipeline, forming a double injection state with the previous set of venturi devices, and carrying out a circulating reaction at the same time, which greatly improves the absorption rate of tetrakis hydroxymethyl phosphonium sulfate to phosphine gas, shortens the reaction time, and increases the output of tetrakis hydroxymethyl phosphonium sulfate. The specific technical scheme is as follows:

[0006] A device for improving the absorption rate of tetrakis(hydroxymethyl)phosphonium sulfate, wherein the batching kettle is connected to a venturi tube through a flame retardant liquid pipe;

[0007] The phosphine gas cabinet is connected to the buffer tank, the buffer tank is connected to the water washing kettle, and the water washing kettle is connected to the venturi through the phosphine pipeline;

[0008] The venturi is connected to the circulating absorption kettle.

[0009] The venturi tube is a double venturi tube channel, one of which penetrates into the lower part of the circulating absorption kettle through the inlet pipe, and the other venturi tube is connected to the top of the circulating absorption kettle.

[0010] The bottom of the circulating absorption kettle is connected with the flame retardant liquid pipe through a circulating pump.

[0011] The bottom of the circulating absorption kettle is also connected to the dilute material storage tank through a circulating pump, wherein a pneumatic valve 1 is provided on the pipeline from the circulating pump to the flame retardant liquid pipe, and a pneumatic valve 2 is provided on the pipeline from the circulating pump to the dilute material storage tank.

[0012] A phosphine tail gas pipeline is also arranged on the top of the circulating absorption kettle.

[0013] The method for improving the absorption rate of tetrakis hydroxymethyl phosphonium sulfate by using the device of the utility model mainly forms a double injection state of tetrakis hydroxymethyl phosphonium sulfate liquid and phosphine gas, improves the absorption rate of tetrakis hydroxymethyl phosphonium sulfate liquid and phosphine gas in a circulation kettle, thereby improving the output of tetrakis hydroxymethyl phosphonium sulfate.

[0014] Tetrakis (hydroxymethyl)phosphonium sulfate is produced by adding a mixture of concentrated sulfuric acid, formaldehyde and water into a circulating kettle in a certain proportion. The phosphine gas is countercurrently contacted and absorbed with the mixed liquid sprayed by the venturi in the circulating kettle to complete the gas-liquid phase synthesis reaction to obtain a 40% THPS aqueous solution. The 40% THPS aqueous solution is evaporated to more than 75% of the main content through the second effect, and then filtered, measured and packaged by a fine filter to obtain the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic structural diagram of a device for improving the absorption rate of tetrakis(hydroxymethyl)phosphonium sulfate, wherein: a batching kettle 1, a phosphine gas cabinet 2, a buffer tank 3, a water washing kettle 4, a phosphine pipeline 5, a venturi 6, a circulating absorption kettle 7, a circulating pump 8, a pneumatic valve 1 9, a pneumatic valve 2 10, a diluent storage tank 11, and a phosphine tail gas pipeline 12. DETAILED DESCRIPTION

[0016] In order to better illustrate the technical solution adopted by the utility model, the utility model patent is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0017] Example 1

[0018] A device for improving the absorption rate of tetrakis(hydroxymethyl)phosphonium sulfate, wherein a batching kettle 1 is connected to a venturi 6 via a flame retardant liquid pipe 13;

[0019] The phosphine gas cabinet 2 is connected to the buffer tank 3, the buffer tank 3 is connected to the water washing kettle 4, and the water washing kettle 4 is connected to the venturi 6 through the phosphine pipeline 5;

[0020] The venturi 6 is connected to the circulating absorption kettle 7 .

[0021] The venturi tube 6 is a double venturi tube channel, one of which penetrates into the lower part of the circulating absorption kettle 7 through the inlet pipe, and the other venturi tube is connected to the top of the circulating absorption kettle 7.

[0022] The bottom of the circulating absorption kettle 7 is connected to the flame retardant liquid pipe 13 through a circulating pump 8.

[0023] The bottom of the circulating absorption kettle 7 is also connected to the diluent storage tank 11 through the circulating pump 8, wherein a pneumatic valve 1 9 is provided on the pipeline from the circulating pump 8 to the flame retardant liquid pipe 13, and a pneumatic valve 2 10 is provided on the pipeline from the circulating pump 8 to the diluent storage tank 11.

[0024] A phosphine tail gas pipeline 12 is also provided on the top of the circulating absorption kettle 7 .

[0025] Tetrakis(hydroxymethyl)phosphorus sulfate liquid (mixed with concentrated sulfuric acid, formaldehyde and water in a certain proportion) is batched in batching kettle 1 and enters into circulating absorption kettle 7 through venturi 6 for reaction;

[0026] Phosphine gas is a by-product of the sodium hypophosphite reaction process, which is stored in the phosphine gas cabinet 2, then enters the buffer tank 3, and then enters the water washing kettle 4 for water washing, and finally enters the circulating absorption kettle 7 through the phosphine pipeline 5 and the venturi 6 for synthetic absorption with the tetrakis(hydroxymethyl)phosphorus sulfate liquid;

[0027] The liquid in the circulating absorption kettle 7 is returned to the circulating kettle 7 through the circulating pump 8 for circulating absorption. During the circulating reaction, the pneumatic valve 1 9 is opened and the pneumatic valve 2 10 is closed;

[0028] After all indicators of the tetrakis(hydroxymethyl)phosphonium sulfate feed liquid are qualified, close the pneumatic valve 1 9, open the pneumatic valve 2 10, and allow the tetrakis(hydroxymethyl)phosphonium sulfate feed liquid after absorption to enter the dilute material storage tank 11;

[0029] Since phosphine gas cannot be completely absorbed 100%, the rich phosphine gas will be transported to the tail gas through the phosphine tail gas pipeline 12 above the circulating absorption kettle 7 for treatment. Phosphine gas is countercurrently contacted and absorbed with the mixed liquid sprayed by the venturi in the circulating kettle to complete the gas phase and liquid phase synthesis reaction to obtain a 40% THPS aqueous solution. The 40% THPS aqueous solution is evaporated to more than 75% of the main content through the II effect, and then filtered, measured and packaged by a fine filter to obtain the product.

Claims

1. A device for improving the absorption rate of tetrakis(hydroxymethyl)phosphonium sulfate, characterized in that: The batching kettle (1) is connected to the venturi (6) via a flame retardant liquid pipe (13); The phosphine gas cabinet (2) is connected to the buffer tank (3), the buffer tank (3) is connected to the water washing kettle (4), and the water washing kettle (4) is connected to the venturi (6) through the phosphine pipeline (5); The venturi (6) is connected to the circulating absorption kettle (7).

2. The device for improving the absorption rate of tetrakis(hydroxymethyl)phosphonium sulfate according to claim 1, characterized in that: The venturi tube (6) is a double venturi tube channel, one of which penetrates into the lower part of the circulating absorption kettle (7) through the inlet pipe, and the other venturi tube is connected to the top of the circulating absorption kettle (7).

3. The device for improving the absorption rate of tetrakis(hydroxymethyl)phosphonium sulfate according to claim 1, characterized in that: The bottom of the circulating absorption kettle (7) is connected to the flame retardant liquid pipe (13) via a circulating pump (8).

4. The device for improving the absorption rate of tetrakis(hydroxymethyl)phosphonium sulfate according to claim 3, characterized in that: The bottom of the circulating absorption kettle (7) is also connected to the thin material storage tank (11) via a circulating pump (8), wherein a pneumatic valve 1 (9) is provided on the pipeline from the circulating pump (8) to the flame retardant liquid pipe (13), and a pneumatic valve 2 (10) is provided on the pipeline from the circulating pump (8) to the thin material storage tank (11).

5. The device for improving the absorption rate of tetrakis(hydroxymethyl)phosphonium sulfate according to claim 1, characterized in that: A phosphine tail gas pipeline (12) is also provided on the top of the circulating absorption kettle (7).

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