CN209957674U - Alkaline washing layering system for 1,1, 2-trichloroethane production - Google Patents
Alkaline washing layering system for 1,1, 2-trichloroethane production Download PDFInfo
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- CN209957674U CN209957674U CN201822240609.2U CN201822240609U CN209957674U CN 209957674 U CN209957674 U CN 209957674U CN 201822240609 U CN201822240609 U CN 201822240609U CN 209957674 U CN209957674 U CN 209957674U
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Abstract
The utility model relates to an alkali wash layering system for 1,1, 2-trichloroethane production, alkali wash layering system includes that alkali prepares jar, alkali wash cauldron A, alkali wash cauldron B, alkali wash cauldron C, alkali wash cauldron D, alkali wash cauldron E, alkali wash cauldron F, alkali wash trichloroethane intermediate tank, alkali metering tank A, alkali metering tank B, alkali lye vacuum cauldron A, alkali lye vacuum cauldron B and vacuum gas holder. The utility model has the advantages that: the utility model sends the 1,1, 2-trichloroethane liquid generated by the chloro addition system to the alkaline washing layering system for 1,1, 2-trichloroethane production for alkaline washing layering, which can effectively remove the impurities in the liquid and further ensure the purity of the product; meanwhile, a plurality of alkali washing kettles are connected in parallel for alkali washing in the alkali washing system, so that the alkali washing efficiency can be greatly improved.
Description
Technical Field
The utility model belongs to the technical field of chemical production device, in particular to an alkali washing layering system for 1,1, 2-trichloroethane production.
Background
1,1, 2-trichloroethane is an important chemical raw material and can be used for preparing chemical products such as vinylidene chloride and the like. 1,1, 2-trichloroethane is generally a chlorination product of vinyl chloride and chlorine as raw materials. The reaction equation is:
。
many documents and patents disclose the preparation of 1,1, 2-trichloroethane, for example patent CN 100335450C discloses a method for preparing 1,1, 2-trichloroethane, comprising the following steps: 1,1, 2-trichloroethane is taken as a circulating medium and is sent into a first mixing and spraying device, vinyl chloride is pumped into a mixing area of the first mixing and spraying device through a vinyl chloride inlet of the first mixing and spraying device, then the chloroethylene dissolved in the 1,1, 2-trichloroethane is sent into a second mixing and spraying device, chlorine is pumped into a mixing area of the second mixing and spraying device through a chlorine inlet of the second mixing and spraying device, in the mixing zone of the second mixing and spraying device, chloroethylene and chlorine gas are mixed and pre-reacted, then the mixture is fed into main pipeline reactor equipped with static mixing component to make continuous reaction to produce 1,1, 2-trichloroethane, the reacted product, the chloroethylene is separated by a gas-liquid separator and enters a subsequent working section, the conversion rate of the chloroethylene can reach more than 98 percent, the selectivity can reach more than 96 percent, and the industrial popularization and use are facilitated; however, this production method has certain disadvantages: in the production process, products generated in the chlorination reaction are separated by a gas-liquid separator, so that certain impurities still remain in the liquid, and the purity of the final product is influenced.
Therefore, it is necessary to develop an alkali washing layered system for 1,1, 2-trichloroethane production, which can improve the product purity.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide an alkali wash layering system that is used for 1,1, 2-trichloroethane production that can improve product purity.
In order to solve the technical problem, the utility model adopts the technical scheme that: the alkaline washing layering system for the production of the 1,1, 2-trichloroethane has the innovation points that: the alkali washing layering system comprises an alkali preparation tank, an alkali washing kettle A, an alkali washing kettle B, an alkali washing kettle C, an alkali washing kettle D, an alkali washing kettle E, an alkali washing kettle F, an alkali washing trichloroethane intermediate tank, an alkali metering tank A, an alkali metering tank B, an alkali vacuum kettle A, an alkali vacuum kettle B and a vacuum gas storage tank;
a chlorination liquid feeding main pipe and an alkali liquid feeding main pipe are sequentially arranged above the alkali washing kettle A, the alkali washing kettle B, the alkali washing kettle C, the alkali washing kettle D, the alkali washing kettle E and the alkali washing kettle F from top to bottom, and the chlorination liquid feeding main pipe is respectively communicated with the alkali washing kettle A, the alkali washing kettle B, the alkali washing kettle C, the alkali washing kettle D, the alkali washing kettle E and the alkali washing kettle F through a chlorination liquid feeding pipe A, a chlorination liquid feeding pipe B, a chlorination liquid feeding pipe C, a chlorination liquid feeding pipe E and a chlorination liquid feeding pipe F; the main chlorinated liquid feeding pipe is also communicated with an alkali liquid vacuum kettle A through a vacuum alkali liquid pipe A, and the vacuum alkali liquid pipe A is communicated with an alkali liquid vacuum kettle B through a vacuum alkali liquid pipe B; the alkali liquor feeding main pipe is communicated with the alkali washing kettle A, the alkali washing kettle B, the alkali washing kettle C, the alkali washing kettle D, the alkali liquor feeding pipe E and the alkali liquor feeding pipe F through an alkali liquor feeding pipe A, an alkali liquor feeding pipe B, an alkali liquor feeding pipe C, an alkali liquor feeding pipe D, an alkali liquor feeding pipe E and an alkali liquor feeding pipe F respectively;
the alkali liquor feeding main pipe is communicated with the bottom end of the alkali metering tank B through an alkali dripping pipe B, and the alkali dripping pipe B is communicated with the bottom end of the alkali metering tank A through an alkali dripping pipe A; the alkali metering tank A and the alkali metering tank B are communicated through an alkali metering pipe, and the alkali metering pipe is communicated with the alkali preparation tank through an alkali liquor feeding pipe;
the vacuum air storage tank is arranged between the alkali liquor vacuum kettle A and the alkali liquor vacuum kettle B, the vacuum air storage tank is respectively communicated with the alkali liquor vacuum kettle A and the alkali liquor vacuum kettle B through a vacuum pipe A and a vacuum pipe B, the top end and the bottom end of the alkali liquor vacuum kettle A are communicated through an alkali liquor circulating pipe A, the alkali liquor circulating pipe A close to the bottom end of the alkali liquor vacuum kettle A is further connected with a vacuum alkali liquor circulating pump A in series, the top end and the bottom end of the alkali liquor vacuum kettle B are communicated through an alkali liquor circulating pipe B, and the alkali liquor circulating pipe B close to the bottom end of the alkali liquor vacuum kettle B is further connected with a vacuum alkali liquor circulating pump;
the alkali washing kettle A, the alkali washing kettle B, the alkali washing kettle C, the alkali washing kettle D, the alkali washing kettle E and the alkali washing kettle F are also respectively communicated with the alkali washing trichloroethane middle tank through a crude product discharge pipe A, a crude product discharge pipe B, a crude product discharge pipe C, a crude product discharge pipe D, a crude product discharge pipe E and a crude product discharge pipe F.
Further, the alkaline washing layering system further comprises an alkaline washing wastewater pool, the bottom end of the alkaline washing kettle F is communicated with the alkaline washing wastewater pool through an alkaline washing wastewater pipeline F, and the alkaline washing wastewater pipeline F is communicated with the alkaline washing kettle A, the alkaline washing wastewater pipeline B, the alkaline washing wastewater pipeline C, the alkaline washing wastewater pipeline D and the alkaline washing wastewater pipeline E through an alkaline washing wastewater pipeline A, an alkaline washing kettle B, an alkaline washing kettle C, an alkaline washing kettle D and an alkaline washing kettle E respectively.
Furthermore, the alkaline washing wastewater pool is communicated with the three-stage sedimentation tank through a high-salinity wastewater pipeline, and a high-salinity wastewater output pump is further connected in series on the high-salinity wastewater pipeline.
The utility model has the advantages that:
(1) the utility model is used for the alkali washing layering system of 1,1, 2-trichloroethane production, the 1,1, 2-trichloroethane liquid generated by the chloro-addition system is sent to the alkali washing layering system of 1,1, 2-trichloroethane production for alkali washing layering, so that the impurities in the liquid can be effectively removed, and the purity of the product is further ensured; meanwhile, a plurality of alkali washing kettles are connected in parallel for alkali washing in the alkali washing system, so that the alkali washing efficiency can be greatly improved;
(2) the utility model is used for the alkaline washing layering system of 1,1, 2-trichloroethane production, wherein, the setting of alkaline washing wastewater disposal basin can effectively avoid destroying the environment with the waste water centralized processing after the layering, accords with the theory of green chemistry.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 and fig. 2 are schematic structural diagrams of the alkaline washing layering system for 1,1, 2-trichloroethane production according to the present invention.
Detailed Description
The following examples are presented to enable those skilled in the art to more fully understand the present invention and are not intended to limit the scope of the present invention.
Examples
The alkaline washing layering system for 1,1, 2-trichloroethane production in the embodiment comprises an alkaline preparation tank 14, an alkaline washing kettle 15A, an alkaline washing kettle 15B, an alkaline washing kettle 15C, an alkaline washing kettle 15D, an alkaline washing kettle 15E, an alkaline washing kettle 15F, an alkaline washing trichloroethane intermediate tank 16, an alkaline metering tank 17A, an alkaline metering tank 17B, an alkaline vacuum kettle 18A, an alkaline vacuum kettle 18B and a vacuum gas storage tank 19, as shown in FIGS. 1 and 2.
A chlorination liquid feeding main pipe and an alkali liquid feeding main pipe are sequentially arranged above the alkali washing kettle 15A, the alkali washing kettle 15B, the alkali washing kettle 15C, the alkali washing kettle 15D, the alkali washing kettle 15E and the alkali washing kettle 15F from top to bottom, and the chlorination liquid feeding main pipe is respectively communicated with the alkali washing kettle 15A, the alkali washing kettle 15B, the alkali washing kettle 15C, the alkali washing kettle 15D, the alkali washing kettle 15E and the alkali washing kettle 15F through a chlorination liquid feeding pipe A, a chlorination liquid feeding pipe B, a chlorination liquid feeding pipe C, a chlorination liquid feeding pipe D, a chlorination liquid feeding pipe E and a chlorination liquid feeding pipe F; the main chloride solution feeding pipe is also communicated with an alkali solution vacuum kettle 18A through a vacuum alkali solution pipe A, and the vacuum alkali solution pipe A is communicated with an alkali solution vacuum kettle 18B through a vacuum alkali solution pipe B; the alkali liquor feeding main pipe is communicated with the alkali washing kettle 15A, the alkali washing kettle 15B, the alkali washing kettle 15C, the alkali washing kettle 15D, the alkali washing kettle 15E and the alkali washing kettle 15F through an alkali liquor feeding pipe A, an alkali liquor feeding pipe B, an alkali liquor feeding pipe C, an alkali liquor feeding pipe D, an alkali liquor feeding pipe E and an alkali liquor feeding pipe F.
The alkali liquor feeding main pipe is communicated with the bottom end of the alkali metering tank 17B through an alkali dripping pipe B, and the alkali dripping pipe B is communicated with the bottom end of the alkali metering tank 17A through an alkali dripping pipe A; the alkali metering tank 17A is communicated with the alkali metering tank 17B through an alkali metering pipe, and the alkali metering pipe is communicated with the alkali preparation tank 14 through an alkali liquor feeding pipe.
The vacuum gas storage tank 19 is arranged between the alkali liquor vacuum kettle 18A and the alkali liquor vacuum kettle 18B, the vacuum gas storage tank 19 is communicated with the alkali liquor vacuum kettle 18A and the alkali liquor vacuum kettle 18B through a vacuum pipe A and a vacuum pipe B respectively, the top end and the bottom end of the alkali liquor vacuum kettle 18A are communicated through an alkali liquor circulating pipe A, a vacuum alkali liquor circulating pump 20A is further arranged on the alkali liquor circulating pipe A close to the bottom end of the alkali liquor vacuum kettle 18A in series, the top end and the bottom end of the alkali liquor vacuum kettle 18B are communicated through an alkali liquor circulating pipe B, and a vacuum alkali liquor circulating pump 20B is further arranged on the alkali liquor circulating pipe B close to the bottom end of.
The alkali washing kettle 15A, the alkali washing kettle 15B, the alkali washing kettle 15C, the alkali washing kettle 15D, the alkali washing kettle 15E and the alkali washing kettle 15F are also respectively communicated with an alkali washing trichloroethane intermediate tank 16 through a crude product discharge pipe A, a crude product discharge pipe B, a crude product discharge pipe C, a crude product discharge pipe D, a crude product discharge pipe E and a crude product discharge pipe F.
As an example, a more specific embodiment is that the alkaline cleaning layered system further includes an alkaline cleaning wastewater pool 21, the bottom end of the alkaline cleaning kettle 15F is further communicated with the alkaline cleaning wastewater pool 21 through an alkaline cleaning wastewater pipeline F, and the alkaline cleaning wastewater pipeline F is further communicated with the alkaline cleaning kettle 15A, the alkaline cleaning kettle 15B, the alkaline cleaning kettle 15C, the alkaline cleaning kettle 15D and the alkaline cleaning kettle 15E through an alkaline cleaning wastewater pipeline a, an alkaline cleaning wastewater pipeline B, an alkaline cleaning wastewater pipeline C, an alkaline cleaning wastewater pipeline D and an alkaline cleaning wastewater pipeline E, respectively; the alkaline washing wastewater tank 21 is communicated with the third-stage sedimentation tank through a high-salinity wastewater pipeline, and a high-salinity wastewater output pump 22 is further connected in series on the high-salinity wastewater pipeline.
The utility model is used for the working process of the alkali washing layering system of 1,1, 2-trichloroethane production as follows:
(1) opening a vacuum valve of the alkaline washing kettle, starting a vacuum alkaline liquor circulating pump 20A and a vacuum alkaline liquor circulating pump 20B, pumping the chlorinated liquid in a chlorinated liquid feeding main pipe into the alkaline washing kettle under a vacuum condition, stopping feeding after reaching a specified liquid level, starting a stirring motor, stirring under a vacuum condition, and in the process, part of waste gas (Cl) is generated2HCl) escapes from the chlorination solution and passes through the alkali liquor vacuum kettle 18A and the alkali liquor vacuum kettleAbsorbing with vacuum alkali solution 18B, and adding NaOH<Switching when the concentration of NaClO is more than or equal to 1% and NaClO is more than or equal to 10%, and pumping the NaClO into a sodium hypochlorite tank by a vacuum alkali liquor circulating pump 20A and a vacuum alkali liquor circulating pump 20B to serve as a byproduct for sale; closing the vacuum valve, opening the tail gas valve, and dropwise adding liquid caustic soda from the caustic metering tank 17A and the caustic metering tank 17B into the caustic washing kettle;
(2) controlling the temperature of the kettle to be 20-30 ℃ by using cooling circulating water of a jacket of an alkali washing kettle, stopping dropwise adding when the pH value of the upper high-salinity wastewater is 7-8 through sampling analysis, and discharging materials from the bottom of the kettle after standing for half an hour: the lower layer is colorless transparent liquid and is placed in an alkaline washing trichloroethane intermediate tank 16 for trichloroethane rectification; the upper layer is yellowish high-salinity wastewater which is put into an alkaline washing wastewater pool 21, then the yellowish high-salinity wastewater is pumped into a three-stage sedimentation tank through a high-salinity wastewater output pump and a high-salinity wastewater output pump 22, and after triple-effect evaporation and concentration treatment, the generated secondary steam water is recycled in a workshop (used for matching alkaline water), and sodium salt is sold and treated.
The basic principles and main features of the invention and the advantages of the invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (3)
1. An alkaline washing layering system for 1,1, 2-trichloroethane production is characterized in that: the alkali washing layering system comprises an alkali preparation tank, an alkali washing kettle A, an alkali washing kettle B, an alkali washing kettle C, an alkali washing kettle D, an alkali washing kettle E, an alkali washing kettle F, an alkali washing trichloroethane intermediate tank, an alkali metering tank A, an alkali metering tank B, an alkali vacuum kettle A, an alkali vacuum kettle B and a vacuum gas storage tank;
a chlorination liquid feeding main pipe and an alkali liquid feeding main pipe are sequentially arranged above the alkali washing kettle A, the alkali washing kettle B, the alkali washing kettle C, the alkali washing kettle D, the alkali washing kettle E and the alkali washing kettle F from top to bottom, and the chlorination liquid feeding main pipe is respectively communicated with the alkali washing kettle A, the alkali washing kettle B, the alkali washing kettle C, the alkali washing kettle D, the alkali washing kettle E and the alkali washing kettle F through a chlorination liquid feeding pipe A, a chlorination liquid feeding pipe B, a chlorination liquid feeding pipe C, a chlorination liquid feeding pipe E and a chlorination liquid feeding pipe F; the main chlorinated liquid feeding pipe is also communicated with an alkali liquid vacuum kettle A through a vacuum alkali liquid pipe A, and the vacuum alkali liquid pipe A is communicated with an alkali liquid vacuum kettle B through a vacuum alkali liquid pipe B; the alkali liquor feeding main pipe is communicated with the alkali washing kettle A, the alkali washing kettle B, the alkali washing kettle C, the alkali washing kettle D, the alkali liquor feeding pipe E and the alkali liquor feeding pipe F through an alkali liquor feeding pipe A, an alkali liquor feeding pipe B, an alkali liquor feeding pipe C, an alkali liquor feeding pipe D, an alkali liquor feeding pipe E and an alkali liquor feeding pipe F respectively;
the alkali liquor feeding main pipe is communicated with the bottom end of the alkali metering tank B through an alkali dripping pipe B, and the alkali dripping pipe B is communicated with the bottom end of the alkali metering tank A through an alkali dripping pipe A; the alkali metering tank A and the alkali metering tank B are communicated through an alkali metering pipe, and the alkali metering pipe is communicated with the alkali preparation tank through an alkali liquor feeding pipe;
the vacuum air storage tank is arranged between the alkali liquor vacuum kettle A and the alkali liquor vacuum kettle B, the vacuum air storage tank is respectively communicated with the alkali liquor vacuum kettle A and the alkali liquor vacuum kettle B through a vacuum pipe A and a vacuum pipe B, the top end and the bottom end of the alkali liquor vacuum kettle A are communicated through an alkali liquor circulating pipe A, the alkali liquor circulating pipe A close to the bottom end of the alkali liquor vacuum kettle A is further connected with a vacuum alkali liquor circulating pump A in series, the top end and the bottom end of the alkali liquor vacuum kettle B are communicated through an alkali liquor circulating pipe B, and the alkali liquor circulating pipe B close to the bottom end of the alkali liquor vacuum kettle B is further connected with a vacuum alkali liquor circulating pump;
the alkali washing kettle A, the alkali washing kettle B, the alkali washing kettle C, the alkali washing kettle D, the alkali washing kettle E and the alkali washing kettle F are also respectively communicated with the alkali washing trichloroethane middle tank through a crude product discharge pipe A, a crude product discharge pipe B, a crude product discharge pipe C, a crude product discharge pipe D, a crude product discharge pipe E and a crude product discharge pipe F.
2. The caustic wash stratification system for 1,1, 2-trichloroethane production of claim 1, wherein: the alkaline washing layering system further comprises an alkaline washing wastewater pool, the bottom end of the alkaline washing kettle F is communicated with the alkaline washing wastewater pool through an alkaline washing wastewater pipeline F, and the alkaline washing wastewater pipeline F is communicated with the alkaline washing kettle A, the alkaline washing kettle B, the alkaline washing wastewater pipeline C, the alkaline washing wastewater pipeline D and the alkaline washing wastewater pipeline E respectively.
3. The caustic wash stratification system for 1,1, 2-trichloroethane production of claim 2, wherein: the alkaline washing wastewater pool is communicated with the three-stage sedimentation tank through a high-salinity wastewater pipeline, and a high-salinity wastewater output pump is further connected in series on the high-salinity wastewater pipeline.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822240609.2U CN209957674U (en) | 2018-12-29 | 2018-12-29 | Alkaline washing layering system for 1,1, 2-trichloroethane production |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822240609.2U CN209957674U (en) | 2018-12-29 | 2018-12-29 | Alkaline washing layering system for 1,1, 2-trichloroethane production |
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| CN209957674U true CN209957674U (en) | 2020-01-17 |
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