CN109574791A - The recovery method of trichloroethanes in a kind of Sucralose tail gas - Google Patents
The recovery method of trichloroethanes in a kind of Sucralose tail gas Download PDFInfo
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- CN109574791A CN109574791A CN201811504573.2A CN201811504573A CN109574791A CN 109574791 A CN109574791 A CN 109574791A CN 201811504573 A CN201811504573 A CN 201811504573A CN 109574791 A CN109574791 A CN 109574791A
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- Prior art keywords
- tail gas
- trichloroethanes
- gas
- sucralose
- recovery method
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C17/00—Preparation of halogenated hydrocarbons
- C07C17/38—Separation; Purification; Stabilisation; Use of additives
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Treating Waste Gases (AREA)
Abstract
The present invention relates to a kind of processing methods of the trichloroethanes in Sucralose tail gas, the following steps are included: Sucralose tail gas washes away HCl gas through water scrubber, remaining moisture in the dry tail gas of drying tower, tail gas after drying enters multi-stage condensing device by roots blower pressurization, condense trichloroethanes present in tail gas, the condensation temperature of tail gas is 0 ~ 20 DEG C, the trichloroethanes liquid and on-condensible gas of formation are sent into knockout drum, after further gas-liquid separation, it obtains the trichloroethanes that purity is 99% and enters recycling storage tank, control recycling pressure of storage tank≤30kpa.The present invention has the advantages that solving the problems, such as that trichloroethanes recycles difficult in Sucralose tail gas, the trichloroethanes of recycling is high-efficient, method is simple, operation is practical.
Description
Technical field
The invention belongs to the preparation methods of chemical technology field Sucralose, more particularly in a kind of Sucralose tail gas
The recovery method of trichloroethanes.
Background technique
In production, tail gas becomes one of reluctant problem, one of harmful substance in tail gas to Sucralose
Trichloroethanes can be harmful to environment, there is cumulative effect in underground water.In to mankind's important foodstuffs chain, especially in it is aquatic
Biological accumulation occurs in organism.Once it is inhaled into, eats, percutaneous absorbtion etc., acute poisoning major determinant central nervous system
System.Less serious case shows as headache, dizziness, lurchs, is incoordination, drowsiness etc.；Weight mix mud with water may occur in which twitch, or even stupor.It can draw
Play cardiac arrhythmia.There are slight degreasing and stimulation to skin.In humid air, especially under solar radiation, corruption is released
The very strong hydrogen chloride smog of corrosion.Therefore, to accomplish not damage while having produced trichloroethanes people it is healthy, do not break
Bad environment just has to handle the trichloroethanes in Sucralose tail gas.
In the technique of currently used Deep Cooling Method recycling Sucralose sulfur dioxide in tail gas, trichloroethanes can be blended in back
In the sulfur dioxide of receipts, and mixed sulfur dioxide and trichloroethanes is difficult to be recycled.
Summary of the invention
The invention aims to solve the problems, such as that trichloroethanes recycles difficult in prior art production, provides one kind three
The recovery method of trichloroethanes in chlorine sucrose tail gas.
The technical solution adopted by the invention is as follows:
The recovery method of trichloroethanes in a kind of Sucralose tail gas, it is characterised in that the following steps are included:
A, Sucralose tail gas first passes around water scrubber, washes away the HCl gas carried secretly in tail gas；
B, enter drying tower by the processed tail gas of water scrubber, with remaining moisture in the dry tail gas of dry liquid；
C, it is pressurizeed by dried tail gas by roots blower and enters shallow cooler, condense three chloroethenes present in tail gas
Alkane, the outlet temperature of shallow cooler are 0 ~ 20 DEG C, and uncondensed gas is cold by the offgas outlet feeding level-one of shallow cooler in shallow cooler
Condenser condenses again, and the outlet temperature of first-stage condenser is controlled at -30 ~ -10 DEG C；
D, in step c condensation and separation of trichloroethanes be sent into knockout drum in, control knockout drum temperature be -18 ~ -22 DEG C.Through
After crossing further gas-liquid separation, obtain the trichloroethanes that purity is 99% and enter trichloroethanes collecting tank, control collect pressure tank≤
30kpa；
E, the remaining gas in trichloroethanes collecting tank continues to be passed through at inlet of Roots blower.
Based on the above technical solution, there is following further improvement project:
Cl in above-mentioned steps a in water scrubber->=500ppm replaces recirculated water.
Purity >=80% of dry liquid in above-mentioned steps b.
Roots blower is opened when fan inlet pressure shows+1KPa in above-mentioned steps c, and the machine outlet valve that blows in,
Fan inlet negative pressure is set in -2KPa.
The advantage of the invention is that recycling trichloroethanes is high-efficient, method is simple, operation is practical.
Detailed description of the invention
Fig. 1 is process flow diagram of the invention.
Specific embodiment
As shown in table 1, the capital equipment that the present invention uses is as shown in the table.
Sucralose tail gas first passes around water scrubber, washes away the HCl carried secretly in tail gas, be equipped in water scrubber circulating water wash device and
Its connected washing pump, as Cl in water scrubber-When >=500ppm, concentrated water extraction.
For the tail gas handled by water scrubber by remaining aqueous vapor in the dry tail gas of drying tower, drying tower is equipped with cyclic drying
System and its connected dry pump, the purity of the concentrated sulfuric acid is 92.5% ~ 98% in drying system.
Tail gas after being dried enters shallow cooler by roots blower, and when inlet of Roots blower pressure normal operating sets
It is set to -2KPa, starts roots blower when fan inlet pressure shows+1KPa, blows in machine outlet valve, and fan inlet negative pressure is set
It is scheduled on -2KPa, the tail gas (sulfur dioxide, trichloroethanes) by roots blower pressurization passes through shallow cooler, and the shallow cooler is with cooling
For water as medium, shallow cooler outlet temperature control forms liquid trichloroethanes and not in 0 ~ 20 DEG C of gas after the condensation of shallow cooler
Solidifying sulfur dioxide gas, liquid trichloroethanes are directly entered knockout drum by the condensate outlet of shallow cooler, and knockout drum temperature is set
It is set to -18 ~ -22 DEG C, the trichloroethanes liquid being further separated out is directly entered collecting tank, and pressure tank≤30kpa is collected in control,
And the not solidifying gas being mingled with is passed through roots blower entrance circulating condensing again again.Solidifying sulfur dioxide gas does not pass through shallow cooler
Offgas outlet be sent into first-stage condenser and condense again, the outlet temperature of condenser is controlled at -30 ~ -10 DEG C, first-stage condenser
Using chilled brine as medium, temperature≤- 25 DEG C for the chilled brine being passed through, condensed sulfur dioxide liquid is sent into recycling storage
It is saved in slot.
The above is only a preferred embodiment of the present invention, it is not intended to restrict the invention, it is noted that for this skill
For the those of ordinary skill in art field, without departing from the technical principles of the invention, can also make it is several improvement and
Modification, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (4)
1. the recovery method of trichloroethanes in a kind of Sucralose tail gas, it is characterised in that the following steps are included:
A, Sucralose tail gas first passes around water scrubber, washes away the HCl gas carried secretly in tail gas；
B, enter drying tower by the processed tail gas of water scrubber, with remaining moisture in the dry tail gas of dry liquid；
C, it is pressurizeed by dried tail gas by roots blower and enters shallow cooler, condense three chloroethenes present in tail gas
Alkane, the outlet temperature of shallow cooler are 0 ~ 20 DEG C, and uncondensed gas is cold by the offgas outlet feeding level-one of shallow cooler in shallow cooler
Condenser condenses again, and the outlet temperature of first-stage condenser controls the liquid SO condensed at -30 ~ -10 DEG C2It is stored up into recycling
Slot；
D, in step c condensation and separation of trichloroethanes be sent into knockout drum in, knockout drum temperature control be -18 ~ -22 DEG C, warp
After crossing further gas-liquid separation, obtain the trichloroethanes that purity is 99% and enter trichloroethanes collecting tank, control collect pressure tank≤
30kpa；
E, the remaining gas in trichloroethanes collecting tank continues to be passed through at inlet of Roots blower.
2. the recovery method of trichloroethanes in a kind of Sucralose tail gas according to claim 1, it is characterised in that described
Cl in step a in water scrubber->=500ppm replaces recirculated water.
3. the recovery method of trichloroethanes in a kind of Sucralose tail gas according to claim 1, it is characterised in that described
Dry liquid is the concentrated sulfuric acid in step b, and purity is 92.5% ~ 98%.
4. the recovery method of trichloroethanes in a kind of Sucralose tail gas according to claim 1, it is characterised in that described
Roots blower is opened when fan inlet pressure shows+1KPa in step c, and the machine outlet valve that blows in, fan inlet negative pressure are set
It is scheduled on -2KPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811504573.2A CN109574791A (en) | 2018-12-10 | 2018-12-10 | The recovery method of trichloroethanes in a kind of Sucralose tail gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811504573.2A CN109574791A (en) | 2018-12-10 | 2018-12-10 | The recovery method of trichloroethanes in a kind of Sucralose tail gas |
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| Publication Number | Publication Date |
|---|---|
| CN109574791A true CN109574791A (en) | 2019-04-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811504573.2A Withdrawn CN109574791A (en) | 2018-12-10 | 2018-12-10 | The recovery method of trichloroethanes in a kind of Sucralose tail gas |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110642267A (en) * | 2019-09-30 | 2020-01-03 | 安徽金禾实业股份有限公司 | Method for recovering trichloroethane from ammonium chloride as by-product of sucralose |
| CN112723630A (en) * | 2020-11-28 | 2021-04-30 | 安徽金禾实业股份有限公司 | Device and method for recovering trichloroethane in total discharge of sucralose chlorination section |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108373139A (en) * | 2018-01-13 | 2018-08-07 | 安徽金禾实业股份有限公司 | The retracting device and recovery method of sulfur dioxide in a kind of Sucralose chlorination reaction |
-
2018
- 2018-12-10 CN CN201811504573.2A patent/CN109574791A/en not_active Withdrawn
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108373139A (en) * | 2018-01-13 | 2018-08-07 | 安徽金禾实业股份有限公司 | The retracting device and recovery method of sulfur dioxide in a kind of Sucralose chlorination reaction |
Non-Patent Citations (1)
| Title |
|---|
| 环境保护部污染防治司和环境保护部环境发展中心: "《国家环境友好企业创建工作手册》", 30 September 2009 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110642267A (en) * | 2019-09-30 | 2020-01-03 | 安徽金禾实业股份有限公司 | Method for recovering trichloroethane from ammonium chloride as by-product of sucralose |
| CN112723630A (en) * | 2020-11-28 | 2021-04-30 | 安徽金禾实业股份有限公司 | Device and method for recovering trichloroethane in total discharge of sucralose chlorination section |
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| PB01 | Publication | ||
| PB01 | Publication | ||
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Application publication date: 20190405 |