CN208345756U - A kind of equipment of the by-product gas purification hydrogen chloride using production trichloro ethylene - Google Patents
A kind of equipment of the by-product gas purification hydrogen chloride using production trichloro ethylene Download PDFInfo
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- CN208345756U CN208345756U CN201820678573.3U CN201820678573U CN208345756U CN 208345756 U CN208345756 U CN 208345756U CN 201820678573 U CN201820678573 U CN 201820678573U CN 208345756 U CN208345756 U CN 208345756U
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Abstract
The utility model provides a kind of equipment of by-product gas purification hydrogen chloride using production trichloro ethylene, it is characterised in that: the equipment includes pretreatment unit, takes off light unit, de- weight unit and product unit；The pretreatment unit connection takes off light unit, takes off the light de- weight unit of unit connection, takes off weight unit and connect product unit.The hydrogen chloride purity is high that the utility model is recycled using the by-product gas in trichloro ethylene production process.
Description
Technical field
The utility model relates to a kind of equipment for refining hydrogen chloride, and in particular to a kind of by-product using production trichloro ethylene
The equipment of gas purification hydrogen chloride belongs to hydrogen chloride technical field of refinement.
Background technique
Since resource consumes excessively and increasingly rare, environmental problem is got worse, and restricts expanding economy and society significantly
Whether the progress of meeting, influence of the process of producing product to environment, resource maximally utilize the sustainable development for being related to society.I
State is organic chlorides big producer, generates a large amount of by-product hydrogen chloride, and the total amount of by-product hydrogen chloride is in the situation of cumulative year after year,
The environment and social resources produce to us impacts, when process system is unable to reuse, the most conventional benefit of by-product hydrogen chloride
It is exactly by-product hydrochloric acid with method.Due to hydrochloric acid market, supply exceed demand, utilizes a large amount of by-product chlorinations with the inexpensive way of by-product hydrochloric acid
Hydrogen is outdated, also usually occurs the ring that individual enterprise's sacrificialing environments obtain company interest when by-product hydrochloric acid sale is at burden
Guarantor's problem, therefore, only exploitation recyclable device are recycled hydrogen chloride resource, can just meet resource-conserving, environmentally friendly
The requirement of social development.
It is to represent organic chlorides to generate a large amount of by-product hydrogen chlorides in process of production with trichloro ethylene, by process units
After included demister, still hydrogen chloride quality is influenced, how to efficiently separate these with heavy constituents such as hydro carbons, water in hydrogen chloride
The heavy constituents such as hydro carbons, water remove oxygen, nitrogen, hydrogen light component, and the high-purity chlorination hydrogen production for obtaining 99.9% or more is this field
Bottleneck problem.
Summary of the invention
The utility model in view of the above technical problems, provides a kind of by-product gas purification chlorination using production trichloro ethylene
The equipment of hydrogen will realize following goal of the invention:
The purity of chlorination hydrogen retrieval product is improved, different size high-purity hydrogen chloride gas is produced.
In order to solve the above technical problems, using following technical scheme:
A kind of equipment of the by-product gas purification hydrogen chloride using production trichloro ethylene, the equipment includes that pretreatment is single
Member takes off light unit, de- weight unit and product unit；The pretreatment unit connection takes off light unit, and it is single to take off the light de- weight of unit connection
Member takes off weight unit and connects product unit.
Preferably, the pretreatment unit includes pretreatment rectifying column, is equipped at the top of the pretreatment rectifying column
Port and inlet；Gas outlet and inlet at the top of the pretreatment rectifying column respectively with the air inlet of rectifying column condenser and
Liquid outlet is connected；
Air inlet in the middle part of the pretreatment rectifying column connects First Heat Exchanger；
The gas outlet of the rectifying column condenser connects the first absorber, and the first absorber connection is de- light
Unit.
Preferably, the pretreatment unit includes pretreatment rectifying column, the gas outlet at the top of the pretreatment rectifying column
The second compressor is connected between the air inlet of rectifying column condenser；
The First Heat Exchanger is connected with the first compressor, and first compressor is connected with the first surge tank.
Preferably, the de- light unit includes lightness-removing column；The lightness-removing column connects pretreatment unit；
In the middle part of the lightness-removing column and bottom is respectively arranged with air inlet and discharge port；The discharge port of the lightness-removing column bottom
The first cooler is connected, first cooler is connected with the first products pot；The de- weight unit of first products pot connection；
Gas outlet and inlet are equipped at the top of the lightness-removing column；Gas outlet and inlet difference at the top of the lightness-removing column
It is connected with the air inlet of condenser of light component removal column and liquid outlet.
Preferably, the de- light unit includes lightness-removing column；Air inlet is connected with the second heat exchanger in the middle part of the lightness-removing column,
Second heat exchanger is connected with third compressor, and the third compressor is connected with the second surge tank；Described second
Surge tank is connected with pretreatment unit.
Preferably, the de- heavy unit includes weight-removing column；The weight-removing column connection takes off light unit；
It is provided with air inlet in the middle part of the weight-removing column, is provided with gas outlet and inlet at the top of the weight-removing column；Institute
The gas outlet at the top of weight-removing column and inlet stated are connected with the air inlet of weight-removing column condenser and liquid outlet respectively.
Preferably, the liquid outlet of the weight-removing column condenser is also connected with the second products pot, and second products pot connects
It is connected to the second absorber；Second absorber connects product unit.
Preferably, the product unit includes product tower；
The de- weight unit of product tower connection；
Air inlet is equipped in the middle part of the product tower；Product tower middle and upper part is provided with gas outlet；On in the product tower
The gas outlet in portion is connected with the second cooler, and second cooler is connected with third products pot.
Preferably, the product unit includes product tower；
The product top of tower is provided with gas outlet and inlet；The gas outlet of the product top of tower and inlet difference
It is connected with the air inlet of product tower condenser and liquid outlet.
Preferably, the pretreatment unit includes the first absorber, and described to take off light unit include condenser of light component removal column, described
De- weight unit includes weight-removing column condenser, and the product unit includes product tower condenser；
First absorber, condenser of light component removal column, weight-removing column condenser 1 and product tower condenser are received with hydrogen chloride
Acquisition means connection.
According to above technical scheme, the utility model has the following beneficial effects:
(1) the hydrogen chloride purity is high that the utility model is recycled using the by-product gas in trichloro ethylene production process.
(2) can simultaneously output different purity specification chlorination hydrogen production, including purity be 99.5%-99.9% technical grade chlorine
Change hydrogen production, the chemical grade product that purity is 99.9%-99.99% and the high purity product that purity is 99.99% or more；
(3) the utility model does not discharge any pernicious gas, and environmental protection is reliable；
(4) the utility model is heated without heat source, effectively save heat source.
(5) Tthe utility model system pressure is stablized, and safety protects the long-acting operation of compressor.
(6) securely and reliably, easy to operate.
The present invention will be further described with case study on implementation with reference to the accompanying drawing.
Detailed description of the invention
Attached drawing 1 is the process flow chart of the utility model embodiment 1；
Wherein, the first surge tank of 101-, the first compressor of 102-, 103- First Heat Exchanger, 104- pre-process rectifying column,
105- rectifying column condenser, the first absorber of 106-, the second surge tank of 107-, the second compressor of 108-, the second heat exchanger of 109-,
110- lightness-removing column, 111- condenser of light component removal column, the first cooler of 112-, the first products pot of 113-, 114- third heat exchanger, 115-
Weight-removing column, 116- weight-removing column condenser, the second products pot of 117-, the second absorber of 118-, the 4th heat exchanger of 119-, 120- product
Tower, 121- product tower condenser, the second cooler of 122-, 123- third products pot, 124- third compressor, 125- hydrogen chloride are received
Acquisition means.
Specific embodiment
Further illustrate system provided in the utility model with reference to the accompanying drawing, but the utility model not therefore by
To any restrictions.
A kind of equipment of the by-product gas purification hydrogen chloride using production trichloro ethylene of embodiment 1
As shown in Figure 1, the utility model provides a kind of setting for by-product gas purification hydrogen chloride using production trichloro ethylene
It is standby, including pretreatment unit, take off light unit, de- weight unit and product unit；
The pretreatment unit connection takes off light unit, takes off the light de- weight unit of unit connection, takes off weight unit and connect product list
Member.
The pretreatment unit includes the first surge tank 101, the first compressor 102, First Heat Exchanger 103, pretreatment
Rectifying column 104, rectifying column condenser 105, the first absorber 106, the second compressor 108 and hydrogen chloride collection device 125；
The pretreatment rectifying column 104 is packed tower, and diameter 600mm, high 30980mm, material is using Q345R+
Monel, filler are 12mm Pall ring；
The rectifying column condenser 105: heat exchange area is 80 ㎡；
First absorber 106: diameter 1000mm, high 2000mm, material is using Q345R+Monel, adsorbent 3-
The 5A molecular sieve of 5mm.
The de- light unit includes the second surge tank 107, third compressor 124, the second heat exchanger 109, lightness-removing column
110, condenser of light component removal column 111, the first cooler 112, the first products pot 113.
The lightness-removing column 110 is packed tower, diameter 300mm, high 16789mm, and material uses Q345R+316L, and filler is
500Y mellapak packing；
111 heat exchange area of condenser of light component removal column is 30 ㎡.
The de- weight unit includes third heat exchanger 114, weight-removing column 115, weight-removing column condenser 116, the second products pot
117, the second absorber 118.
The weight-removing column 115 is packed tower, diameter 200mm, high 80798mm, and material uses Q345R+316L, and filler is
900X wire packing.
Second absorber 118: diameter 1000mm, high 2000mm, material is using Q345R+Monel, adsorbent 3-
The 5A molecular sieve of 5mm.
The product unit includes the 4th heat exchanger 119, product tower 120, product tower condenser 121, the second cooler
122, third products pot 123.
The product tower 120 is packed tower, diameter 200mm, high 80798mm, and material uses Q345R+316L, and filler is
1200X wire packing.
Rectifying column condenser 105, condenser of light component removal column 111, weight-removing column condenser 116 and the product tower condenser
Environmental protection refrigerant F32 is all made of in 121 as refrigerant.
Connection between above equipment is pipeline connection.
First surge tank 101 connects the first compressor 102, and the first compressor 102 connects First Heat Exchanger 103,
104 middle part of the connection pretreatment of First Heat Exchanger 103 rectifying column, second compression of gas outlet connection at 104 top of pretreatment rectifying column
Machine 108, the second compressor 108 connect the air inlet on 105 top of rectifying column condenser, and 105 lower part of rectifying column condenser goes out liquid
The inlet at 104 top of mouth connection pretreatment rectifying column, the gas outlet of 105 lower part of rectifying column condenser connects the first absorber
The gas outlet of the air inlet on 106 tops, the lower part of first absorber 106 connects hydrogen chloride collection device 125.
The gas outlet of the lower part of first absorber 106 is also connected with 107 air inlet of the second surge tank, the second surge tank
107 air inlets are also connected with hydrogen chloride collection device 125.
The gas outlet of second surge tank 107 connects third compressor 124, and the connection of third compressor 124 second is changed
Hot device 109, the second heat exchanger 109 connect 110 middle part air inlet of lightness-removing column, and the gas outlet connection at 110 top of lightness-removing column is de-
The air inlet of light 111 lower part of tower condenser, the feed liquor at 110 top of liquid outlet connection lightness-removing column of 111 lower part of condenser of light component removal column
Mouthful；The air inlet of discharge port connection 112 bottom of the first cooler of 110 bottom of lightness-removing column, 112 top of the first cooler
The air inlet of the first products pot of gas outlet 113；
Gas outlet connection weight-removing column 115 middle part of first products pot 113, the bottom connection of the weight-removing column 115 the
Three heat exchangers 114；The air inlet of gas outlet connection 116 bottom of weight-removing column condenser at 115 top of weight-removing column, weight-removing column are cold
The inlet at 115 top of liquid outlet connection weight-removing column of 116 bottom of condenser, the liquid outlet of 116 bottom of weight-removing column condenser also connect
The feed inlet of the second products pot 117 is connect, the inlet at 115 top of weight-removing column is also connected with the feed inlet of the second products pot 117.
The feed inlet on discharge port connection 118 top of the second absorber of second products pot 117.
120 middle part of discharge port connection product tower of second absorber, 118 lower part, the gas outlet at 120 top of product tower
Connect the air inlet of 121 bottom of product tower condenser, 120 top of liquid outlet connection product tower of 121 bottom of product tower condenser
Inlet；The gas outlet of 120 middle and upper part of product tower connects 122 air inlet of the second cooler, second cooler 122
Gas outlet connection third products pot 123 air inlet.
The gas outlet of the condenser of light component removal column 111, weight-removing column condenser 116 and the top of product tower condenser 121 with
Hydrogen chloride collection device 125 connects.
A kind of technique of the by-product gas purification hydrogen chloride using production trichloro ethylene of embodiment 2
The technique includes the next steps:
Step 1 buffer compression
The raw material of use are as follows: the by-product gas generated in trichloro ethylene production process, the by-product gas are chloride containing
The mixed gas of hydrogen, the mixed gas includes following components: hydrogen chloride, nitrogen, oxygen, carbon dioxide, hydrogen, moisture,
Trichloro ethylene and tetrachloro-ethylene.
The by-product gas enters the first surge tank 101 by pipeline, and flow velocity of the by-product gas in pipeline is
2500Kg/h analyzes the chlorination hydrogen purity > 98% in the first surge tank 101,
By-product gas flows out to the first compressor 102 from the first surge tank 101 and is compressed, and compressed temperature of charge is
20 DEG C, pressure 0.6MPa.
Step 2 pretreatment
Compressed by-product gas is exchanged heat by First Heat Exchanger 103 and kettle liquid in tower, and kettle liquid is in the tower
Liquid hydrogen chloride, temperature are 15 DEG C, and kettle liquid height is the 70% of total height, tower pressure interior force 0.55MPa in tower；
Gas enters 104 middle part of pretreatment rectifying column after heat exchange；The light component that pretreatment rectifying column 104 distills out is from advance
The gas outlet for managing 104 top of rectifying column enters the second compressor 108, after 108 adherence pressure to 1.7MPa of the second compressor
It is condensed into condensate liquid into rectifying column condenser 105, condensation temperature is -32 DEG C；
The condensate liquid is back in pretreatment rectifying column 104, and the uncooled gas phase of 1800Kg/h enters the first absorption
Device 106；It is adsorbed by the first absorber 106, obtains technical grade chlorination hydrogen production, collected, take into hydrogen chloride collection device 125
It is 99.65%, i.e. the technical grade chlorination hydrogen production of 99.5% or more output that sample, which analyzes product purity,.
It include hydrogen chloride, trichloro ethylene and tetrachloro-ethylene in the kettle liquid component that pretreatment 104 tower bottom of rectifying column is formed；
Through detecting, the constituent content of tower bottom kettle liquid are as follows: hydrogen chloride mass percentage is 97.5%, trichloro ethylene quality hundred
Dividing content is 1%, and tetrachloro-ethylene mass percentage is 0.8%.
The distillation of step 3 lightness-removing column
99.5% or more the technical grade chlorination hydrogen production obtained passes through the second surge tank 107 with the speed of 400Kg/h；By
Third compressor 124 compresses, and compressed gas pressure is 4.2MPa, 40 DEG C of temperature, into lightness-removing column 110, controls lightness-removing column
110 pressure be 4.2-4.3MPa, controlled at -20 DEG C to -22 DEG C, in lightness-removing column 110 light component by top gas outlet
Import condenser of light component removal column 111；The temperature of 110 tower top of lightness-removing column is 25 DEG C, and gaseous phase materials enter condenser of light component removal column
111, -21 DEG C of condensation temperature, after the condensation of condenser of light component removal column 111, condensate liquid is formed in 111 bottom of condenser of light component removal column and is flowed back to
In lightness-removing column 110；Condensate liquid flows back in lightness-removing column 110 with gas converting heat in tower, forms kettle liquid, kettle liquid temperature is 35 DEG C；
The hydrogen chloride gas gathered at the top of condenser of light component removal column 111 imports in hydrogen chloride collection device 125, i.e. output
99.5% or more technical grade chlorination hydrogen production.
The first cooler 112 is imported in 110 bottoms material of lightness-removing column, is cooled to 0.5 DEG C through the first cooler 112, then
Flow into the first products pot 113, through analysis the first products pot 113 in chlorination hydrogen purity be 99.94% to get arrive 99.9% or more purity
Chemical grade product.
The distillation of step 4 weight-removing column
It is passed through hot water into the end socket collet of the first products pot 113,99.9% or more hydrogen chloride liquid of storage is carried out
Pressurization, pressure are promoted to 4.0MPa by 3.9MPa, enter gas in the first products pot 113 in weight-removing column 115, flow velocity is
120Kg/h, the weight-removing column 115: controlled at -23 DEG C to -25 DEG C, control pressure is 4.0-4.1MPa,
Top gaseous phase enters weight-removing column condenser 116 and is condensed, and condensation temperature is -24 DEG C, and most materials pass through
Condensate liquid is formed after condensation；
Uncooled hydrogen chloride gas is gathered at the top of weight-removing column condenser 116, uncooled hydrogen chloride gas imports chlorine
Change hydrogen collection device 125, i.e. the technical grade chlorination hydrogen production of 99.5% or more output.
The condensate liquid of 116 bottom of weight-removing column condenser outflow is partly refluxed in weight-removing column 115, and another part condensate liquid is adopted
Out in the second products pot 117；
It is back to material in the condensate liquid and tower in weight-removing column 115 and carries out heat exchange, bottom is flowed into, through analyzing bottom material
Chlorination hydrogen purity be 99.9%-99.99% to get arrive 99.9% or more purity chemical grade product.
Extraction removes beavy metal impurity by absorber 118 to the condensate liquid in the second products pot 117.
Step 5 product column distillation
The material derived from the absorber 118 enters 120 middle part of product tower, flow velocity 100Kg/h,
Product tower 120: control pressure is 3.9-4.0MPa, controls -25 DEG C to -27 DEG C of temperature, Liquid level is in 60%-
80%,
Top gaseous phase enters product tower condenser 121, and condensation temperature is -26 DEG C, and most materials are through being subcooled after condensation
It is back to product tower 120 after solidifying, heat exchange is carried out with material in tower, in 120 middle and upper part of product tower (specifically apart from product tower tower
Push up the position of 1.5m or so) the gas collected of catch tray, exported and produced by side line, the gas of extraction enters the second cooler
In 122, gas after cooling enters the collection of third products pot 123；Obtained hydrogen chloride product purity is 99.99992%, is adopted
Flow velocity is 89Kg/h out.
At 121 top of product tower condenser, uncooled hydrogen chloride gas imports hydrogen chloride collection device 125, i.e. output
99.5% or more technical grade chlorination hydrogen production.
A small amount of material is gathered in the bottom of product tower 120, through analyzing, bottom feed purity 99.9%-99.99% is to get arriving
The chemical grade product of 99.9% or more purity.
In addition to specified otherwise, ratio described in the utility model is mass ratio, and the percentage is quality hundred
Score.
Finally it is noted that the foregoing is merely the preferred embodiment of the utility model, it is not limited to this
Utility model, although the utility model is described in detail referring to aforementioned case study on implementation, single pair is in the technology of this field
For personnel, it can still modify to the technical solution in aforementioned case study on implementation.All spirit and original in the utility model
Within then, the modification and improvement done are included in the protection scope of the present invention.
Claims (10)
1. a kind of equipment of the by-product gas purification hydrogen chloride using production trichloro ethylene, it is characterised in that: the equipment packet
It includes pretreatment unit, take off light unit, de- weight unit and product unit；The pretreatment unit connection takes off light unit, takes off light unit
The de- weight unit of connection takes off weight unit and connects product unit.
2. a kind of equipment of by-product gas purification hydrogen chloride using production trichloro ethylene according to claim 1, special
Sign is: the pretreatment unit includes pretreatment rectifying column (104), is equipped at the top of the pretreatment rectifying column (104)
Gas outlet and inlet；It is described pretreatment rectifying column (104) at the top of gas outlet and inlet respectively with rectifying column condenser
(105) air inlet and liquid outlet is connected；
Air inlet in the middle part of pretreatment rectifying column (104) connects First Heat Exchanger (103)；
The gas outlet of described rectifying column condenser (105) lower part connects the first absorber (106), first absorber
(106) connection takes off light unit.
3. a kind of equipment of by-product gas purification hydrogen chloride using production trichloro ethylene according to claim 2, special
Sign is: the pretreatment unit includes pretreatment rectifying column (104), the outlet at the top of pretreatment rectifying column (104)
The second compressor (108) are connected between mouth and the air inlet of rectifying column condenser (105)；
The First Heat Exchanger (103) is connected with the first compressor (102), and it is slow that first compressor (102) is connected with first
Rush tank (101).
4. a kind of equipment of by-product gas purification hydrogen chloride using production trichloro ethylene according to claim 1, special
Sign is: the de- light unit includes lightness-removing column (110)；The lightness-removing column (110) connects pretreatment unit；
In the middle part of the lightness-removing column (110) and bottom is respectively arranged with air inlet and discharge port；Lightness-removing column (110) bottom
Discharge port connects the first cooler (112), and first cooler (112) is connected with the first products pot (113)；Described first
The de- weight unit of products pot (113) connection；
Gas outlet and inlet are equipped at the top of the lightness-removing column (110)；Gas outlet and feed liquor at the top of the lightness-removing column (110)
Mouth is connected with the air inlet of condenser of light component removal column (111) and liquid outlet respectively.
5. a kind of equipment of by-product gas purification hydrogen chloride using production trichloro ethylene according to claim 1, special
Sign is: the de- light unit includes lightness-removing column (110)；Air inlet is connected with the second heat exchange in the middle part of the lightness-removing column (110)
Device (109), second heat exchanger (109) are connected with third compressor (124), third compressor (124) connection
There are the second surge tank (107)；Second surge tank (107) is connected with pretreatment unit.
6. a kind of equipment of by-product gas purification hydrogen chloride using production trichloro ethylene according to claim 1, special
Sign is: the de- heavy unit includes weight-removing column (115)；Weight-removing column (115) connection takes off light unit；
It is provided with air inlet in the middle part of the weight-removing column (115), is provided with gas outlet and feed liquor at the top of the weight-removing column (115)
Mouthful；Gas outlet and inlet at the top of the weight-removing column (115) with the air inlet of weight-removing column condenser (116) and out liquid respectively
Mouth is connected.
7. a kind of equipment of by-product gas purification hydrogen chloride using production trichloro ethylene according to claim 6, special
Sign is:
The liquid outlet of the weight-removing column condenser (116) is also connected with the second products pot (117), second products pot
(117) the second absorber (118) are connected with；Second absorber (118) connects product unit.
8. a kind of equipment of by-product gas purification hydrogen chloride using production trichloro ethylene according to claim 1, special
Sign is:
The product unit includes product tower (120)；
The de- weight unit of product tower (120) connection；
Air inlet is equipped in the middle part of the product tower (120)；Product tower (120) middle and upper part is provided with gas outlet；The product
The gas outlet of tower (120) middle and upper part is connected with the second cooler (122), and second cooler (122) is connected with third product
Tank (123).
9. a kind of equipment of by-product gas purification hydrogen chloride using production trichloro ethylene according to claim 1, special
Sign is:
The product unit includes product tower (120)；
Gas outlet and inlet are provided at the top of the product tower (120)；Gas outlet and feed liquor at the top of the product tower (120)
Mouth is connected with the air inlet of product tower condenser (121) and liquid outlet respectively.
10. a kind of equipment of by-product gas purification hydrogen chloride using production trichloro ethylene according to claim 1, special
Sign is:
The pretreatment unit includes the first absorber (106), and described to take off light unit include condenser of light component removal column (111), described
De- weight unit includes weight-removing column condenser (116), and the product unit includes product tower condenser (121)；
First absorber (106), condenser of light component removal column (111), weight-removing column condenser (116) and product tower condenser
(121) it is connect with hydrogen chloride collection device (125).
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| Application Number | Priority Date | Filing Date | Title |
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| CN2017213332748 | 2017-10-17 | ||
| CN201721333274 | 2017-10-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107746040A (en) * | 2017-10-17 | 2018-03-02 | 山东新龙科技股份有限公司 | A kind of Processes and apparatus that hydrogen chloride is refined using the by-product gas for producing trichloro ethylene |
-
2018
- 2018-05-08 CN CN201820678573.3U patent/CN208345756U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107746040A (en) * | 2017-10-17 | 2018-03-02 | 山东新龙科技股份有限公司 | A kind of Processes and apparatus that hydrogen chloride is refined using the by-product gas for producing trichloro ethylene |
| CN107746040B (en) * | 2017-10-17 | 2021-04-13 | 山东新龙科技股份有限公司 | Process and equipment for refining hydrogen chloride by using byproduct gas from production of trichloroethylene |
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| GR01 | Patent grant | ||
| GR01 | Patent grant |