Continuous evaporation system for tetrakis (hydroxymethyl) phosphonium chloride

Abstract

The utility model discloses a continuous evaporation system for tetrakis (hydroxymethyl) phosphonium chloride. The continuous evaporation system comprises a first-effect evaporation device, a second-effect evaporation device and a third-effect evaporation device which are arranged in sequence, the first-effect evaporation device comprises a first-effect graphite tube preheater, a first-effect graphite tube evaporator and a first-effect graphite flash evaporator; the second-effect evaporation device comprises a second-effect graphite tube nest evaporator and a second-effect graphite flash evaporator; and the triple-effect evaporation device comprises a triple-effect graphite tube nest evaporator and a triple-effect graphite flash evaporator. According to the utility model, the steam can be utilized in a multi-stage manner, the steam generated after the material liquid of the first-effect evaporator is evaporated is fed into the second-effect evaporator to serve as a heat source, and the steam generated by the second-effect evaporator is used as a heat source of the third-effect evaporator, so that the steam energy consumption can be effectively reduced, the evaporation time is shortened, and the energy consumption is reduced. And the whole process is in a closed state, and condensate water is not discharged and can be used as water for batching in other procedures, so that the production purposes of energy conservation and emission reduction are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of tetrakis (hydroxymethyl) phosphonium chloride production, and specifically refers to a continuous evaporation system for tetrakis (hydroxymethyl) phosphonium chloride. Background Art

[0002] The evaporation process of traditional flame retardant products adopts a glass-lined reaction kettle (referred to as "concentration kettle") and an intermittent evaporation technology with indirect heating by a jacket. The feed liquid is added into the glass-lined reaction kettle, and then low-pressure saturated steam is introduced into the jacket of the concentration kettle for indirect heating. A large amount of steam is consumed during the concentration process, and the concentration time is relatively long. Moreover, it belongs to an intermittent production mode. The evaporated gas is not easy to recover, and the output of a single concentration kettle is relatively low, and the evaporation time is long. If the production capacity needs to be expanded, the same device needs to be repeatedly added, which occupies a large area and requires a large equipment investment. Content of the Utility Model

[0003] The purpose of the utility model is to overcome the above deficiencies and provide a continuous evaporation system for tetrakis (hydroxymethyl) phosphonium chloride, which can reduce the consumption of steam energy, shorten the evaporation time, improve the production efficiency, and achieve the production purpose of energy conservation and emission reduction.

[0004] The technical solution adopted by the utility model is as follows:

[0005] A continuous evaporation system for tetrakis (hydroxymethyl) phosphonium chloride includes a first-effect evaporation device, a second-effect evaporation device, and a third-effect evaporation device arranged in sequence; the first-effect evaporation device includes a first-effect graphite tube preheater, a first-effect graphite tube evaporator, and a first-effect graphite flash evaporator; the second-effect evaporation device includes a second-effect graphite tube evaporator and a second-effect graphite flash evaporator; the third-effect evaporation device includes a third-effect graphite tube evaporator and a third-effect graphite flash evaporator.

[0006] The bottom feed port of the first-effect graphite tube preheater is connected to a dilute material tank, and the top discharge port is connected to the bottom feed port of the first-effect graphite tube evaporator; the top discharge port of the first-effect graphite tube evaporator is connected to the upper feed port of the first-effect graphite flash evaporator. A steam inlet is provided below the first-effect graphite tube evaporator, and a steam outlet is provided above it. The steam inlet is connected to external hot steam, and the steam outlet is connected to the bottom of the first-effect graphite tube preheater; the bottom of the first-effect graphite flash evaporator is connected to a first-effect return pipeline and a first-effect feeding pipeline. The first-effect return pipeline is connected to the bottom feed port of the first-effect graphite tube evaporator, and the first-effect feeding pipeline is connected to the bottom feed port of the second-effect graphite tube evaporator. A steam outlet is provided at the top of the first-effect graphite flash evaporator and is connected to the lower part of the second-effect graphite tube evaporator.

[0007] The top discharge port of the second-effect graphite tube evaporator is connected to the upper feed port of the second-effect graphite flash evaporator. The bottom of the second-effect graphite flash evaporator is connected to the second-effect return pipeline and the second-effect feed pipeline. The second-effect return pipeline is connected to the bottom feed port of the second-effect graphite tube evaporator, and the second-effect feed pipeline is connected to the bottom feed port of the third-effect graphite tube evaporator. A steam outlet is provided at the top of the second-effect graphite flash evaporator and is connected to the lower part of the third-effect graphite tube evaporator.

[0008] The top discharge port of the third-effect graphite tube evaporator is connected to the upper feed port of the third-effect graphite flash evaporator. A steam outlet is provided at the top of the third-effect graphite flash evaporator and is connected to the condenser. The bottom of the third-effect graphite flash evaporator is connected to the third-effect return pipeline and the third-effect feed pipeline. The third-effect return pipeline is connected to the bottom feed port of the third-effect graphite tube evaporator, the third-effect feed pipeline is connected to the feed port of the graphite tube heat exchanger, and the discharge port of the graphite tube heat exchanger is connected to the concentrated storage tank.

[0009] A steam condensate outlet is provided above the first-effect graphite tube preheater and is connected to the condensate tank. Steam outlets are provided above both the second-effect graphite tube evaporator and the third-effect graphite tube evaporator, and both steam outlets are connected to the condensate tank.

[0010] Cooling water inlets are provided at the bottoms of both the condenser and the graphite tube heat exchanger, and cooling water outlets are provided at the tops. The cooling water is discharged externally through cooling water pipeline 1 and cooling water pipeline 2 respectively.

[0011] The condenser is externally connected to a vacuum unit, and the vacuum unit is connected to the total cooling water pipeline.

[0012] A steam condensate outlet is provided behind the condenser and is connected to the condensate tank through steam condensate pipeline 1.

[0013] The beneficial effects of the present utility model are as follows:

[0014] The present utility model can utilize steam in multiple stages. The steam generated after evaporating the liquid in the first-effect evaporator is sent to the second-effect evaporator as a heat source, and the steam generated by the evaporation of the second-effect evaporator is used as the heat source of the third-effect evaporator. In this way, the steam energy consumption can be effectively reduced, the evaporation time can be shortened, and the production efficiency can be improved. The entire production process is in a closed state, and the condensate is not discharged externally and can be used as the batching water for other processes, achieving the production purpose of energy conservation and emission reduction. Description of the Drawings

[0015] Figure 1 It is a structural schematic diagram of a continuous evaporation system for tetrakis(hydroxymethyl)phosphonium chloride.

[0016] Description of the markings in the figure: thinner tank 1, first-effect graphite tube preheater 2, first-effect graphite tube evaporator 3, first-effect graphite flash evaporator 4, second-effect graphite tube evaporator 5, second-effect graphite flash evaporator 6, third-effect graphite tube evaporator 7, third-effect graphite flash evaporator 8, graphite tube heat exchanger 9, condenser 10, concentrated storage tank 11, condensate tank 12, total cooling water pipeline 13, vacuum unit 14, first-effect return pipeline 101, first-effect feeding pipeline 102, second-effect return pipeline 201, second-effect feeding pipeline 202, third-effect return pipeline 301, third-effect feeding pipeline 302, steam condensate pipeline one 401, cooling water return pipeline one 402, cooling water return pipeline two 403, steam condensate pipeline two 404. Detailed implementation mode

[0017] The present utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0018] Embodiment 1

[0019] As Figure 1 shown, a continuous evaporation system for tetramethylolphosphonium chloride includes a first-effect evaporation device, a second-effect evaporation device, and a third-effect evaporation device arranged in sequence; the first-effect evaporation device includes a first-effect graphite tube preheater 2, a first-effect graphite tube evaporator 3, and a first-effect graphite flash evaporator 4; the second-effect evaporation device includes a second-effect graphite tube evaporator 5 and a second-effect graphite flash evaporator 6; the third-effect evaporation device includes a third-effect graphite tube evaporator 7 and a third-effect graphite flash evaporator 8.

[0020] The bottom feed port of the first-effect graphite tube preheater 2 is connected to the thinner tank 1, and the top discharge port is connected to the bottom feed port of the first-effect graphite tube evaporator 3; the top discharge port of the first-effect graphite tube evaporator 3 is connected to the upper feed port of the first-effect graphite flash evaporator 4. A steam inlet is provided below the first-effect graphite tube evaporator 3, and a steam outlet is provided above it. The steam inlet is connected to external hot steam, and the steam outlet is connected to the bottom of the first-effect graphite tube preheater 2; the bottom of the first-effect graphite flash evaporator 4 is connected to the first-effect return pipeline 101 and the first-effect feeding pipeline 102. The first-effect return pipeline 101 is connected to the bottom feed port of the first-effect graphite tube evaporator 3, and the first-effect feeding pipeline 102 is connected to the bottom feed port of the second-effect graphite tube evaporator 5. A steam outlet is provided at the top of the first-effect graphite flash evaporator 4 and is connected to the lower part of the second-effect graphite tube evaporator 5.

[0021] The top discharge port of the second-effect graphite shell-and-tube evaporator 5 is connected to the upper feed port of the second-effect graphite flash evaporator 6. The bottom of the second-effect graphite flash evaporator 6 is connected to a second-effect return pipeline 201 and a second-effect feed pipeline 202. The second-effect return pipeline 201 is connected to the bottom feed port of the second-effect graphite shell-and-tube evaporator 5, and the second-effect feed pipeline 202 is connected to the bottom feed port of the third-effect graphite shell-and-tube evaporator 7. A steam outlet is provided at the top of the second-effect graphite flash evaporator 6 and is connected to the lower part of the third-effect graphite shell-and-tube evaporator 7.

[0022] The top discharge port of the third-effect graphite shell-and-tube evaporator 7 is connected to the upper feed port of the third-effect graphite flash evaporator 8. A steam outlet is provided at the top of the third-effect graphite flash evaporator 8 and is connected to the condenser 10. The bottom of the third-effect graphite flash evaporator 8 is connected to a third-effect return pipeline 301 and a third-effect feed pipeline 302. The third-effect return pipeline 301 is connected to the bottom feed port of the third-effect graphite shell-and-tube evaporator 7, the third-effect feed pipeline 302 is connected to the feed port of the graphite shell-and-tube heat exchanger 9, and the discharge port of the graphite shell-and-tube heat exchanger 9 is connected to the concentrated storage tank 11.

[0023] A steam condensate outlet is provided above the first-effect graphite shell-and-tube preheater 2 and is connected to the condensate tank 12. Steam outlets are provided above both the second-effect graphite shell-and-tube evaporator 5 and the third-effect graphite shell-and-tube evaporator 7, and both steam outlets are connected to the condensate tank 12.

[0024] Cooling water inlets are provided at the bottoms of both the condenser 10 and the graphite shell-and-tube heat exchanger 9, and cooling water outlets are provided at the tops. The cooling water is discharged externally through a cooling water pipeline 402 and a cooling water pipeline 403 respectively.

[0025] The condenser 10 is externally connected to a vacuum unit 14, and the vacuum unit 14 is connected to a cooling water main pipeline 13.

[0026] A steam condensate outlet is provided behind the condenser 10 and is connected to the condensate tank 12 through a steam condensate pipeline 401.

[0027] Embodiment 2

[0028] The working principle of the present utility model is as follows:

[0029] The device described in Embodiment 1 is adopted. First, hot steam is conveyed to the first-effect graphite shell-and-tube evaporator 3, and the steam then flows out through the steam outlet above the first-effect graphite shell-and-tube evaporator 3 and subsequently enters the first-effect graphite shell-and-tube preheater 2.

[0030] The material in the thinner tank 1 is the by-product of sodium hypophosphite, tetrakis(hydroxymethyl)phosphonium chloride solution. The material is transported from the thinner tank 1 into the first-effect graphite tube preheater 2, where it is preheated by steam. Subsequently, it is transported into the first-effect graphite tube evaporator 3, where the hot steam in the first-effect graphite tube evaporator 3 performs primary evaporation and concentration on the material. Then it is transported to the first-effect graphite flash evaporator 4 for further flash evaporation and concentration. The material can be refluxed to the first-effect graphite tube evaporator 3 through the first-effect return pipeline 101 for evaporation and concentration, and then enter the first-effect graphite flash evaporator 4 again for flash evaporation, performing cyclic concentration. After the cyclic concentration is completed, the material flows out of the first-effect graphite flash evaporator 4 and flows into the second-effect graphite tube evaporator 5 through the first-effect feeding pipeline 102. The material can also not undergo the cyclic concentration process, flow out from the bottom of the first-effect graphite flash evaporator 4, and directly flow into the second-effect graphite tube evaporator 5 through the first-effect feeding pipeline 102.

[0031] The steam generated by the first-effect graphite flash evaporator 4 flows out from the upper part of the first-effect graphite flash evaporator 4 and enters from the lower part of the second-effect graphite tube evaporator 5. The steam generated by the first-effect graphite flash evaporator 4 is used to perform secondary evaporation and concentration on the material in the second-effect graphite tube evaporator 5. Subsequently, the material enters the second-effect graphite flash evaporator 6 through the discharge port above the second-effect graphite tube evaporator 5 for further flash evaporation and concentration. The material can be refluxed to the second-effect graphite tube evaporator 5 through the second-effect return pipeline 201 for evaporation and concentration, and then enter the second-effect graphite flash evaporator 6 again for flash evaporation, performing cyclic concentration. After the cyclic concentration is completed, the material flows out of the second-effect graphite flash evaporator 6 and flows into the third-effect graphite tube evaporator 7 through the second-effect feeding pipeline 202. The material can also not undergo the cyclic concentration process, flow out from the bottom of the second-effect graphite flash evaporator 6, and directly flow into the third-effect graphite tube evaporator 7 through the second-effect feeding pipeline 202.

[0032] The steam generated by the second-effect graphite flash evaporator 6 flows out from the upper part of the second-effect graphite flash evaporator 6 and enters from the lower part of the third-effect graphite tube evaporator 7. The steam generated by the second-effect graphite flash evaporator 6 is used to perform tertiary evaporation and concentration on the material in the third-effect graphite tube evaporator 7. Subsequently, the material enters the third-effect graphite flash evaporator 8 through the discharge port above the third-effect graphite tube evaporator 7 for further flash evaporation and concentration. The material can be refluxed to the third-effect graphite tube evaporator 7 through the third-effect return pipeline 301 for evaporation and concentration, and then enter the third-effect graphite flash evaporator 8 again for flash evaporation, performing cyclic concentration. After the cyclic concentration is completed, the material flows out of the third-effect graphite flash evaporator 8 and flows into the graphite tube heat exchanger 9 through the third-effect feeding pipeline 302. The material can also not undergo the cyclic concentration process, flow out from the bottom of the third-effect graphite flash evaporator 8, and directly flow into the graphite tube heat exchanger 9 through the third-effect feeding pipeline 302.

[0033] External cooling water is introduced from the bottom of the graphite tube heat exchanger 9 and the condenser 10, and flows out from the top of the graphite tube heat exchanger 9 and the condenser 10. The material flowing into the graphite tube heat exchanger 9 is cooled by cooling water and then enters the concentrated storage tank 11. The steam generated by the three-effect graphite flash evaporator 8 flows out from the top of the three-effect graphite flash evaporator 8, enters from the front end of the condenser 10, and is cooled to become steam condensed water; the steam condensed water flows out from the rear end of the condenser 10 through the steam condensed water pipeline 1 401 and enters the condensed water tank 12; part of the steam condensed water can also be merged into the cooling water main pipeline 13 through the steam condensed water pipeline 2 404, making full use of the residual cold capacity of the steam condensed water to achieve the cooling of the steam.

[0034] The steam outlet from the top of the single-effect graphite tube evaporator 3 is a mixture of steam and liquid. After passing through the single-effect graphite tube preheater 2, the steam condensate is basically discharged to the condensate tank 12 through the pipeline; the steam outlet from the top of the second-effect graphite tube evaporator 5 is a mixture of steam and liquid, which is discharged to the condensate tank 12 through the pipeline; the steam outlet from the top of the triple-effect graphite tube evaporator 7 is a mixture of steam and liquid, which is discharged to the condensate tank 12 through the pipeline. The whole process is in a closed state, and the condensate is not discharged. It can be used as water for ingredients in other processes, and pollution is also avoided.

[0035] In the single-effect graphite tube preheater 2, the single-effect graphite tube evaporator 3, the second-effect graphite tube evaporator 5 and the third-effect graphite tube evaporator 7, the material flows through the tube side and the steam flows through the shell side; in the graphite tube heat exchanger 9, the material flows through the tube side and the cooling water flows through the shell side; in the condenser 10, the steam flows through the tube side and the cooling water flows through the shell side.

[0036] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limitations of the present invention. The embodiments and features in the embodiments of the present application can be arbitrarily combined with each other without conflict. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A tetrakis(hydroxymethyl)phosphonium chloride continuous evaporation system, characterized in that: The bottom feed port of the single-effect graphite tube preheater (2) is connected to the thinning material tank (1), and the top discharge port is connected to the bottom feed port of the single-effect graphite tube evaporator (3); the top discharge port of the single-effect graphite tube evaporator (3) is connected to the upper feed port of the single-effect graphite flash evaporator (4); the single-effect graphite tube evaporator (3) is provided with a steam inlet at the bottom and a steam outlet at the top, the steam inlet is connected to the external hot steam, and the steam outlet is connected to the single-effect graphite tube preheater (2 ) at the bottom; the bottom of the first-effect graphite flash evaporator (4) is connected to a first-effect return pipeline (101) and a first-effect feed pipeline (102); the first-effect return pipeline (101) is connected to a bottom feed port of the first-effect graphite tube evaporator (3); the first-effect feed pipeline (102) is connected to a bottom feed port of the second-effect graphite tube evaporator (5); and a steam outlet is provided at the top of the first-effect graphite flash evaporator (4) and is connected to the bottom of the second-effect graphite tube evaporator (5).

2. The tetrakis(hydroxymethyl)phosphonium chloride continuous evaporation system according to claim 1, characterized in that: The top discharge port of the second-effect graphite tube evaporator (5) is connected to the upper feed port of the second-effect graphite flash evaporator (6); the bottom of the second-effect graphite flash evaporator (6) is connected to a second-effect return pipeline (201) and a second-effect feed pipeline (202); the second-effect return pipeline (201) is connected to the bottom feed port of the second-effect graphite tube evaporator (5); the second-effect feed pipeline (202) is connected to the bottom feed port of the triple-effect graphite tube evaporator (7); and a steam outlet is provided at the top of the second-effect graphite flash evaporator (6) and is connected to the bottom of the triple-effect graphite tube evaporator (7).

3. The tetrakis(hydroxymethyl)phosphonium chloride continuous evaporation system according to claim 2, characterized in that: The top discharge port of the three-effect graphite tube evaporator (7) is connected to the upper feed port of the three-effect graphite flash evaporator (8); the top of the three-effect graphite flash evaporator (8) is provided with a steam outlet connected to the condenser (10); the bottom of the three-effect graphite flash evaporator (8) is connected to a three-effect return pipeline (301) and a three-effect feed pipeline (302); the three-effect return pipeline (301) is connected to the bottom feed port of the three-effect graphite tube evaporator (7); the three-effect feed pipeline (302) is connected to the feed port of the graphite tube heat exchanger (9); and the discharge port of the graphite tube heat exchanger (9) is connected to the concentration storage tank (11).

4. The tetrakis(hydroxymethyl)phosphonium chloride continuous evaporation system according to claim 3, characterized in that: The first-effect graphite tube preheater (2) is provided with a steam condensate outlet on its top, which is connected to a condensate tank (12); the second-effect graphite tube evaporator (5) and the third-effect graphite tube evaporator (7) are both provided with steam outlets on their tops, which are both connected to a condensate tank (12).

5. The tetrakis(hydroxymethyl)phosphonium chloride continuous evaporation system according to claim 4, characterized in that: The condenser (10) and the graphite tube heat exchanger (9) are both provided with a cooling water inlet at the bottom and a cooling water outlet at the top, and the cooling water is discharged through a cooling water pipeline 1 (402) and a cooling water pipeline 2 (403) respectively.

6. The tetrakis(hydroxymethyl)phosphonium chloride continuous evaporation system according to claim 5, characterized in that: The condenser (10) is externally connected to a vacuum unit (14), and the vacuum unit (14) is connected to a cooling water main pipeline (13).

7. The tetrakis(hydroxymethyl)phosphonium chloride continuous evaporation system according to claim 6, characterized in that: The condenser (10) is provided with a steam condensate outlet at the rear, which is connected to the condensate tank (12) via a steam condensate pipeline (401).

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