A method and system for concentrating hydrogen peroxide

Abstract

The present application relates to a hydrogen peroxide concentration method, the steps comprising: delivering utility high pressure steam to a first inlet of an indirect heat exchanger, delivering secondary high pressure steam output from a second outlet of the indirect heat exchanger to a first inlet of a steam jet pump, delivering low pressure steam output from a first outlet of a rectification column to a second inlet of the steam jet pump, delivering mixed steam output from an outlet of the steam jet pump to a first inlet of a hydrogen peroxide concentration evaporator, and delivering mixed steam condensate output from a first outlet of the hydrogen peroxide concentration evaporator to an inlet of a mixed steam condensate booster pump. The hydrogen peroxide concentration method and system of the present application have a low content of impurities in the mixed steam condensate, which can be reused as water for extraction of hydrogen peroxide after being pressurized.

Description

Technical Field

[0001] This invention relates to the field of hydrogen peroxide concentration technology, and in particular to a method and system for hydrogen peroxide concentration. Background Technology

[0002] Currently, hydrogen peroxide is prepared using the anthraquinone process, with a typical concentration of 27.5 wt% to 35 wt%. Higher concentrations can be obtained through evaporation and concentration. Hydrogen peroxide evaporation and concentration involves using a falling film evaporator to perform low-temperature vacuum evaporation of 27.5 wt% to 35 wt% hydrogen peroxide. The resulting secondary process steam enters a distillation column, where deionized water comes into counter-current contact with the secondary process steam from the top of the column, and mass transfer occurs on the liquid film on the packing surface. Concentrated hydrogen peroxide is collected from the bottom of the column. The secondary steam at the top contains trace amounts of hydrogen peroxide; part of it is recovered by a steam ejector as a heat source for concentration, and the remainder is condensed and discharged for reuse. The high-concentration hydrogen peroxide at the bottom of the falling film evaporator is continuously refluxed using a circulating pump, with a portion produced as concentrated hydrogen peroxide.

[0003] However, hydrogen peroxide concentration and evaporation technology is an energy-intensive operation. To reduce energy consumption, a steam jet pump is usually used to use high-pressure steam from the utility plant as a power source and pressurize the low-pressure steam from the secondary process in the hydrogen peroxide concentration and evaporation process. The mixed steam is used as a heat source for heating hydrogen peroxide evaporation and concentration. However, the mixed steam condensate usually contains a small amount of organic impurities, hydrogen peroxide, iron filings and other impurities (the iron filings are brought in by the high-pressure steam from the utility plant, and the small amount of organic impurities and hydrogen peroxide are brought in by the low-pressure steam from the secondary process). Therefore, it cannot be recovered as conventional process steam condensate, nor can it be reused as extraction water. It can only be discharged as wastewater or used as makeup water for circulating water.

[0004] Therefore, there is an urgent need for a method and system for hydrogen peroxide concentration. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a method and system for concentrating hydrogen peroxide.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] The first aspect of the present invention is to provide a method for concentrating hydrogen peroxide, comprising the steps of:

[0008] The high-pressure steam from the utility works is delivered to the first inlet of the indirect heat exchanger. The second-highest pressure steam output from the second outlet of the indirect heat exchanger is delivered to the first inlet of the steam jet pump. The low-pressure steam output from the first outlet of the distillation column is delivered to the second inlet of the steam jet pump. The mixed steam output from the outlet of the steam jet pump is delivered to the first inlet of the hydrogen peroxide enrichment evaporator. The mixed steam condensate output from the first outlet of the hydrogen peroxide enrichment evaporator is delivered to the inlet of the mixed steam condensate pressurization pump.

[0009] Preferably, the first outlet of the indirect heat exchanger outputs high-pressure steam condensate from the utility.

[0010] Preferably, the mixed steam condensate includes: a first mixed steam condensate conveyed from the first outlet of the hydrogen peroxide enrichment evaporator to the inlet of the mixed steam condensate buffer tank, and a second mixed steam condensate conveyed from the outlet of the mixed steam condensate buffer tank to the inlet of the mixed steam condensate pressurization pump.

[0011] Preferably, the outlet of the mixed steam condensate pressurization pump outputs pressurized mixed steam condensate, and part or all of the pressurized mixed steam condensate is reused as extraction water for hydrogen peroxide.

[0012] Preferably, if a portion of the pressurized mixed steam condensate is reused, the remaining portion of the pressurized mixed steam condensate is transported to the second inlet of the indirect heat exchanger; if all of the pressurized mixed steam condensate is reused, the first deionized water is transported to the second inlet of the indirect heat exchanger.

[0013] Preferably, the steps further include:

[0014] The first high-concentration hydrogen peroxide liquid phase output from the second outlet of the hydrogen peroxide enrichment evaporator is transported to the inlet of the enrichment evaporator circulation pump, the second high-concentration hydrogen peroxide liquid phase output from the first outlet of the enrichment evaporator circulation pump is transported to the second inlet of the hydrogen peroxide enrichment evaporator, and the third high-concentration hydrogen peroxide liquid phase output from the second outlet of the enrichment evaporator circulation pump is produced as the first concentrated hydrogen peroxide product.

[0015] Preferably, the steps further include:

[0016] The hydrogen peroxide saturated vapor output from the third outlet of the hydrogen peroxide concentration evaporator is transported to the first inlet of the distillation column, the second deionized water is transported to the second inlet of the distillation column, the second outlet of the distillation column outputs the distillate, and the third outlet of the distillation column outputs the second hydrogen peroxide concentrate.

[0017] Furthermore, the operating pressure of the high-pressure steam in the utility is 0.5 MPa to 3.0 MPa (gauge pressure).

[0018] Furthermore, the operating pressure of the secondary high-pressure steam is 0.4 MPa to 2.8 MPa (gauge pressure).

[0019] Furthermore, the operating pressure of the low-pressure steam is -0.101 MPa to -0.05 MPa (gauge pressure).

[0020] Furthermore, the operating pressure of the mixed steam is 0.001 MPa to 1.0 MPa (absolute pressure).

[0021] A second aspect of the present invention is to provide a hydrogen peroxide concentration system, comprising: an indirect heat exchanger, a steam jet pump, a hydrogen peroxide concentration evaporator, a mixed steam condensate pressurization pump, a concentration evaporator circulation pump, a distillation column, and a second hydrogen peroxide concentration tank; wherein,

[0022] The outlet of the high-pressure steam pipeline of the utility works is connected to the first inlet pipeline of the indirect heat exchanger, and the first outlet of the indirect heat exchanger is connected to the inlet pipeline of the high-pressure steam condensate pipeline of the utility works.

[0023] The second outlet of the indirect heat exchanger is connected to the first inlet of the steam jet pump via a secondary high-pressure steam pipeline. The outlet of the steam jet pump is connected to the first inlet of the hydrogen peroxide concentration evaporator via a mixed steam pipeline. The first outlet of the hydrogen peroxide concentration evaporator is connected to the inlet of the mixed steam condensate pressurization pump via a mixed steam condensate pipeline. The outlet of the mixed steam condensate pressurization pump is connected to the inlet of the pressurized mixed steam condensate pipeline and the inlet of the reuse pipeline, respectively. The outlet of the pressurized mixed steam condensate pipeline and the outlet of the first deionized water pipeline are connected to the second inlet of the indirect heat exchanger, respectively.

[0024] The second outlet of the hydrogen peroxide concentration evaporator is connected to the inlet pipe of the concentration evaporator circulation pump. The outlet of the concentration evaporator circulation pump is connected to the inlet of the high-concentration hydrogen peroxide liquid phase pipe and the inlet pipe of the first hydrogen peroxide concentrate pipe. The outlet of the high-concentration hydrogen peroxide liquid phase pipe is connected to the second inlet pipe of the hydrogen peroxide concentration evaporator.

[0025] The third outlet of the hydrogen peroxide concentration evaporator is connected to the first inlet pipe of the distillation column, the outlet of the second deionized water pipe is connected to the second inlet pipe of the distillation column, the first outlet of the distillation column is connected to the second inlet pipe of the steam jet pump via a low-pressure steam pipe, the second outlet of the distillation column is connected to the inlet pipe of the distillate pipe, the third outlet of the distillation column is connected to the inlet pipe of the second hydrogen peroxide concentration tank, and the outlet of the second hydrogen peroxide concentration tank is connected to the inlet pipe of the second hydrogen peroxide concentration pipe.

[0026] Preferably, it further includes: a mixed steam condensate buffer tank; wherein,

[0027] The first outlet of the hydrogen peroxide concentration evaporator is connected to the inlet pipe of the mixed steam condensate buffer tank via a first mixed steam condensate pipeline, and the outlet of the mixed steam condensate buffer tank is connected to the inlet pipe of the mixed steam condensate pressurization pump via a second mixed steam condensate pipeline.

[0028] The present invention adopts the above technical solution and has the following technical effects compared with the prior art:

[0029] The mixed steam condensate in the hydrogen peroxide concentration method and system of the present invention has a low content of impurities and can be reused as extraction water for hydrogen peroxide after pressurization. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the hydrogen peroxide concentration system in Embodiment 2 of the present invention;

[0031] The reference numerals in the figures include:

[0032] Indirect heat exchanger 1; steam jet pump 2; hydrogen peroxide concentration evaporator 3; mixed steam condensate buffer tank 4; mixed steam condensate pressurization pump 5; concentration evaporator circulation pump 6; distillation column 7; second hydrogen peroxide concentration tank 8. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0035] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the scope of the invention.

[0036] Example 1

[0037] This embodiment provides a hydrogen peroxide concentration system, including: an indirect heat exchanger 1, a steam jet pump 2, a hydrogen peroxide concentration evaporator 3, a mixed steam condensate pressurization pump 5, a concentration evaporator circulation pump 6, a distillation column 7, and a second hydrogen peroxide concentration tank 8; wherein...

[0038] The outlet of the high-pressure steam pipeline of the utility works is connected to the first inlet pipeline of the indirect heat exchanger 1, and the first outlet of the indirect heat exchanger 1 is connected to the inlet pipeline of the high-pressure steam condensate pipeline of the utility works.

[0039] The second outlet of the indirect heat exchanger 1 is connected to the first inlet pipe of the steam jet pump 2 via a secondary high-pressure steam pipeline. The outlet of the steam jet pump 2 is connected to the first inlet pipe of the hydrogen peroxide concentration evaporator 3 via a mixed steam pipeline. The first outlet of the hydrogen peroxide concentration evaporator 3 is connected to the inlet pipe of the mixed steam condensate pressurization pump 5 via a mixed steam condensate pipeline. The outlet of the mixed steam condensate pressurization pump 5 is connected to the inlet of the pressurized mixed steam condensate pipeline and the inlet pipe of the reuse pipeline, respectively. The outlet of the pressurized mixed steam condensate pipeline is connected to the second inlet pipe of the indirect heat exchanger 1.

[0040] The second outlet of the hydrogen peroxide concentration evaporator 3 is connected to the inlet pipe of the concentration evaporator circulation pump 6. The outlet of the concentration evaporator circulation pump 6 is connected to the inlet of the high-concentration hydrogen peroxide liquid phase pipeline and the inlet pipe of the first hydrogen peroxide concentrate pipeline. The outlet of the high-concentration hydrogen peroxide liquid phase pipeline is connected to the second inlet pipe of the hydrogen peroxide concentration evaporator 3.

[0041] The third outlet of the hydrogen peroxide concentration evaporator 3 is connected to the first inlet pipe of the distillation column 7, the outlet of the second deionized water pipe is connected to the second inlet pipe of the distillation column 7, the first outlet of the distillation column 7 is connected to the second inlet pipe of the steam jet pump 2 via a low-pressure steam pipe, the second outlet of the distillation column 7 is connected to the inlet pipe of the distillate pipe, the third outlet of the distillation column 7 is connected to the inlet pipe of the second hydrogen peroxide concentration tank 8, and the outlet of the second hydrogen peroxide concentration tank 8 is connected to the inlet pipe of the second hydrogen peroxide concentration pipe.

[0042] This embodiment also provides a method for concentrating hydrogen peroxide, the steps of which include:

[0043] High-pressure steam from the utility system, operating at 1.5 MPa (gauge pressure), is delivered to the first inlet of the indirect heat exchanger 1. Second-high pressure steam (operating pressure 1.0 MPa, gauge pressure) output from the second outlet of the indirect heat exchanger 1 is delivered to the first inlet of the steam jet pump 2. Low-pressure steam (operating pressure 0.008 MPa, absolute pressure) output from the first outlet of the distillation column 7 is delivered to the second inlet of the steam jet pump 2. Mixed steam (operating pressure 0.015 MPa, absolute pressure) output from the outlet of the steam jet pump 2 is delivered to the first inlet of the hydrogen peroxide enrichment evaporator 3. Mixed steam condensate output from the first outlet of the hydrogen peroxide enrichment evaporator 3 is delivered to the inlet of the mixed steam condensate pressurization pump 5.

[0044] The first outlet of the indirect heat exchanger 1 outputs high-pressure steam condensate for public works; the outlet of the mixed steam condensate pressurization pump 5 outputs pressurized mixed steam condensate, part of which is reused as extraction water for hydrogen peroxide, and the remaining part of which is transported to the second inlet of the indirect heat exchanger 1.

[0045] The first high-concentration hydrogen peroxide liquid phase output from the second outlet of the hydrogen peroxide enrichment evaporator 3 is transported to the inlet of the enrichment evaporator circulation pump 6, the second high-concentration hydrogen peroxide liquid phase output from the first outlet of the enrichment evaporator circulation pump 6 is transported to the second inlet of the hydrogen peroxide enrichment evaporator 3, and the third high-concentration hydrogen peroxide liquid phase output from the second outlet of the enrichment evaporator circulation pump 6 is produced as the first concentrated hydrogen peroxide product.

[0046] The hydrogen peroxide saturated vapor output from the third outlet of the hydrogen peroxide concentration evaporator 3 is transported to the first inlet of the distillation column 7, the second deionized water is transported to the second inlet of the distillation column 7, the second outlet of the distillation column 7 outputs the distilled liquid, and the third outlet of the distillation column 7 outputs the second concentrated hydrogen peroxide product.

[0047] In a preferred embodiment, the indirect heat exchanger 1 is a shell-and-tube heat exchanger.

[0048] Example 2

[0049] like Figure 1 As shown, this embodiment provides another hydrogen peroxide concentration system, which, unlike embodiment 1, further includes: a mixed vapor condensate buffer tank 4; wherein,

[0050] The first outlet of the hydrogen peroxide concentration evaporator 3 is connected to the inlet pipe of the mixed steam condensate buffer tank 4 via the first mixed steam condensate pipeline, and the outlet of the mixed steam condensate buffer tank 4 is connected to the inlet pipe of the mixed steam condensate pressurization pump 5 via the second mixed steam condensate pipeline.

[0051] This embodiment also provides another method for hydrogen peroxide concentration, which differs from Example 1, and includes the following steps:

[0052] High-pressure steam from the utility system, operating at 2.0 MPa (gauge pressure), is delivered to the first inlet of the indirect heat exchanger 1. Second-high pressure steam (operating pressure 1.2 MPa, gauge pressure) output from the second outlet of the indirect heat exchanger 1 is delivered to the first inlet of the steam jet pump 2. Low-pressure steam (operating pressure 0.005 MPa, absolute pressure) output from the first outlet of the distillation column 7 is delivered to the second inlet of the steam jet pump 2. Mixed steam (operating pressure 0.05 MPa, absolute pressure) output from the outlet of the steam jet pump 2 is delivered to the first inlet of the hydrogen peroxide enrichment evaporator 3. The first mixed steam condensate output from the first outlet of the hydrogen peroxide enrichment evaporator 3 is delivered to the inlet of the mixed steam condensate buffer tank 4. The second mixed steam condensate output from the outlet of the mixed steam condensate buffer tank 4 is delivered to the inlet of the mixed steam condensate pressurization pump 5.

[0053] Example 3

[0054] This embodiment provides another hydrogen peroxide concentration system, which differs from Embodiment 2, wherein...

[0055] The outlet of the mixed steam condensate pressurization pump 5 is connected to the inlet pipe of the reuse pipeline, and the outlet of the first deionized water pipeline is connected to the second inlet pipe of the indirect heat exchanger 1.

[0056] This embodiment also provides another method for hydrogen peroxide concentration, which differs from Example 1, and includes the following steps:

[0057] High-pressure steam from the utility system, operating at 1.2 MPa (gauge pressure), is delivered to the first inlet of the indirect heat exchanger 1. Second-high pressure steam (operating pressure 1.0 MPa, gauge pressure) output from the second outlet of the indirect heat exchanger 1 is delivered to the first inlet of the steam jet pump 2. Low-pressure steam (operating pressure 0.01 MPa, absolute pressure) output from the first outlet of the distillation column 7 is delivered to the second inlet of the steam jet pump 2. Mixed steam (operating pressure 0.03 MPa, absolute pressure) output from the outlet of the steam jet pump 2 is delivered to the first inlet of the hydrogen peroxide enrichment evaporator 3. The first mixed steam condensate output from the first outlet of the hydrogen peroxide enrichment evaporator 3 is delivered to the inlet of the mixed steam condensate buffer tank 4. The second mixed steam condensate output from the outlet of the mixed steam condensate buffer tank 4 is delivered to the inlet of the mixed steam condensate pressurization pump 5. All pressurized mixed steam condensate is reused as extraction water for hydrogen peroxide, and the first deionized water is delivered to the second inlet of the indirect heat exchanger 1.

[0058] In summary, the mixed steam condensate in the hydrogen peroxide concentration method and system of the present invention has a low content of impurities and can be reused as extraction water for hydrogen peroxide after pressurization.

[0059] The above description is merely a preferred embodiment of the present invention and does not limit the implementation and protection scope of the present invention. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for concentrating hydrogen peroxide, characterized in that the steps include... include: High-pressure steam from the utility works is transported to the first inlet of an indirect heat exchanger (1), and high-pressure steam condensate from the utility works is output from the first outlet of the indirect heat exchanger (1). Second-high pressure steam output from the second outlet of the indirect heat exchanger (1) is transported to the first inlet of a steam jet pump (2). Low-pressure steam output from the first outlet of a distillation column (7) is transported to the second inlet of the steam jet pump (2). Mixed steam output from the outlet of the steam jet pump (2) is transported to the first inlet of a hydrogen peroxide enrichment evaporator (3). Mixed steam condensate output from the first outlet of the hydrogen peroxide enrichment evaporator (3) is transported to the inlet of a mixed steam condensate pressurization pump (5). The mixed steam condensate comprises: from the... The first outlet of the hydrogen peroxide concentration evaporator (3) delivers the first mixed steam condensate to the inlet of the mixed steam condensate buffer tank (4) and the second mixed steam condensate from the outlet of the mixed steam condensate buffer tank (4) to the inlet of the mixed steam condensate pressurizing pump (5). The outlet of the mixed steam condensate pressurizing pump (5) outputs pressurized mixed steam condensate. Part or all of the pressurized mixed steam condensate is reused as extraction water for hydrogen peroxide. If part of the pressurized mixed steam condensate is reused, the remaining part of the pressurized mixed steam condensate is delivered to the second inlet of the indirect heat exchanger (1). If all of the pressurized mixed steam condensate is reused, the first deionized water is delivered to the second inlet of the indirect heat exchanger (1). The first high-concentration hydrogen peroxide liquid phase output from the second outlet of the hydrogen peroxide enrichment evaporator (3) is transported to the inlet of the enrichment evaporator circulation pump (6), the second high-concentration hydrogen peroxide liquid phase output from the first outlet of the enrichment evaporator circulation pump (6) is transported to the second inlet of the hydrogen peroxide enrichment evaporator (3), and the third high-concentration hydrogen peroxide liquid phase output from the second outlet of the enrichment evaporator circulation pump (6) is produced as the first concentrated hydrogen peroxide product. The hydrogen peroxide saturated vapor output from the third outlet of the hydrogen peroxide concentration evaporator (3) is transported to the first inlet of the distillation column (7), the second deionized water is transported to the second inlet of the distillation column (7), the distillate is output from the second outlet of the distillation column (7), and the second hydrogen peroxide concentrate is output from the third outlet of the distillation column (7).

2. A hydrogen peroxide concentration system employing the hydrogen peroxide concentration method as described in claim 1, characterized in that, include: Indirect heat exchanger (1), steam jet pump (2), hydrogen peroxide concentration evaporator (3), mixed steam condensate pressurization pump (5), concentration evaporator circulation pump (6), distillation column (7), second hydrogen peroxide concentration tank (8); among which, The outlet of the high-pressure steam pipeline of the utility is connected to the first inlet pipeline of the indirect heat exchanger (1), and the first outlet of the indirect heat exchanger (1) is connected to the inlet pipeline of the high-pressure steam condensate pipeline of the utility. The second outlet of the indirect heat exchanger (1) is connected to the first inlet pipe of the steam jet pump (2) via a secondary high-pressure steam pipeline. The outlet of the steam jet pump (2) is connected to the first inlet pipe of the hydrogen peroxide concentration evaporator (3) via a mixed steam pipeline. The first outlet of the hydrogen peroxide concentration evaporator (3) is connected to the inlet pipe of the mixed steam condensate pressurization pump (5) via a mixed steam condensate pipeline. The outlet of the mixed steam condensate pressurization pump (5) is connected to the inlet of the pressurized mixed steam condensate pipeline and the inlet pipe of the reuse pipeline, respectively. The outlet of the pressurized mixed steam condensate pipeline and the outlet of the first deionized water pipeline are connected to the second inlet pipe of the indirect heat exchanger (1), respectively. The second outlet of the hydrogen peroxide concentration evaporator (3) is connected to the inlet pipe of the concentration evaporator circulation pump (6). The outlet of the concentration evaporator circulation pump (6) is connected to the inlet of the high-concentration hydrogen peroxide liquid phase pipeline and the inlet pipe of the first hydrogen peroxide concentration pipeline. The outlet of the high-concentration hydrogen peroxide liquid phase pipeline is connected to the second inlet pipe of the hydrogen peroxide concentration evaporator (3). The third outlet of the hydrogen peroxide concentration evaporator (3) is connected to the first inlet pipe of the distillation column (7), the outlet of the second deionized water pipe is connected to the second inlet pipe of the distillation column (7), the first outlet of the distillation column (7) is connected to the second inlet pipe of the steam jet pump (2) via a low-pressure steam pipe, the second outlet of the distillation column (7) is connected to the inlet pipe of the distillate pipe, the third outlet of the distillation column (7) is connected to the inlet pipe of the second hydrogen peroxide concentration tank (8), and the outlet of the second hydrogen peroxide concentration tank (8) is connected to the inlet pipe of the second hydrogen peroxide concentration pipe.

3. The hydrogen peroxide concentration system according to claim 2, characterized in that, It also includes: a mixed steam condensate buffer tank (4); wherein, The first outlet of the hydrogen peroxide concentration evaporator (3) is connected to the inlet pipe of the mixed steam condensate buffer tank (4) via the first mixed steam condensate pipeline, and the outlet of the mixed steam condensate buffer tank (4) is connected to the inlet pipe of the mixed steam condensate pressurization pump (5) via the second mixed steam condensate pipeline.

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