CN114432985A - Method and system for discharging waste alkali liquor in organic silicon production - Google Patents
Method and system for discharging waste alkali liquor in organic silicon production Download PDFInfo
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- CN114432985A CN114432985A CN202210148773.9A CN202210148773A CN114432985A CN 114432985 A CN114432985 A CN 114432985A CN 202210148773 A CN202210148773 A CN 202210148773A CN 114432985 A CN114432985 A CN 114432985A
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- 239000003513 alkali Substances 0.000 title claims abstract description 341
- 238000000034 method Methods 0.000 title claims abstract description 55
- 239000002699 waste material Substances 0.000 title claims abstract description 53
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 28
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 229910052710 silicon Inorganic materials 0.000 title claims abstract description 22
- 239000010703 silicon Substances 0.000 title claims abstract description 22
- 238000007599 discharging Methods 0.000 title claims abstract description 21
- 239000000413 hydrolysate Substances 0.000 claims abstract description 67
- 239000010865 sewage Substances 0.000 claims abstract description 62
- LIKFHECYJZWXFJ-UHFFFAOYSA-N dimethyldichlorosilane Chemical compound C[Si](C)(Cl)Cl LIKFHECYJZWXFJ-UHFFFAOYSA-N 0.000 claims abstract description 46
- 239000007788 liquid Substances 0.000 claims abstract description 31
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 30
- 229910000041 hydrogen chloride Inorganic materials 0.000 claims abstract description 30
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 claims abstract description 30
- HEMHJVSKTPXQMS-UHFFFAOYSA-M sodium hydroxide Inorganic materials [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 306
- 238000003756 stirring Methods 0.000 claims description 118
- 239000000243 solution Substances 0.000 claims description 48
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 44
- 239000003921 oil Substances 0.000 claims description 27
- 239000011259 mixed solution Substances 0.000 claims description 25
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 22
- 238000005086 pumping Methods 0.000 claims description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 6
- KTQYJQFGNYHXMB-UHFFFAOYSA-N dichloro(methyl)silicon Chemical compound C[Si](Cl)Cl KTQYJQFGNYHXMB-UHFFFAOYSA-N 0.000 claims 1
- 239000005048 methyldichlorosilane Substances 0.000 claims 1
- 238000005406 washing Methods 0.000 abstract description 8
- 230000008676 import Effects 0.000 abstract 1
- 230000007062 hydrolysis Effects 0.000 description 13
- 238000006460 hydrolysis reaction Methods 0.000 description 13
- 230000000052 comparative effect Effects 0.000 description 9
- 238000002479 acid--base titration Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 208000028659 discharge Diseases 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 4
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 4
- 108010009736 Protein Hydrolysates Proteins 0.000 description 4
- 235000011941 Tilia x europaea Nutrition 0.000 description 4
- 239000000460 chlorine Substances 0.000 description 4
- 229910052801 chlorine Inorganic materials 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 4
- 239000004571 lime Substances 0.000 description 4
- 150000001804 chlorine Chemical class 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000002894 chemical waste Substances 0.000 description 1
- 150000003841 chloride salts Chemical class 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/0006—Controlling or regulating processes
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F7/00—Compounds containing elements of Groups 4 or 14 of the Periodic Table
- C07F7/02—Silicon compounds
- C07F7/08—Compounds having one or more C—Si linkages
- C07F7/20—Purification, separation
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
Abstract
The application provides a method and a system for discharging waste alkali liquor in organic silicon production, which comprises the following steps: carry dimethyl dichlorosilane's hydrolysate to the stirred tank in, pump inorganic alkali lye from the alkali lye storage tank to the stirred tank in through the circulating pump, wherein, the circulating pump is connected between alkali lye storage tank and stirred tank, inorganic alkali lye mixes with the hydrolysate in order to get rid of the hydrogen chloride in the hydrolysate in the stirred tank, obtain mixed liquid, stratify mixed liquid in the phase separator, wherein, the phase separator is connected between alkali lye storage tank and stirred tank, import lower floor's alkali lye into the alkali lye storage tank, so that pump again to the stirred tank in through the circulating pump, when alkali lye mass concentration is less than or equal to 2%, pump alkali lye to sewage treatment plant through the dredge pump. The method realizes the purpose of discharging the waste alkali liquor in the process of carrying out alkali washing on the dimethyl dichlorosilane hydrolysate.
Description
Technical Field
The application relates to the field of chemical waste alkali liquor pollution discharge, in particular to a method and a system for discharging waste alkali liquor in organic silicon production.
Background
The content of residual chlorine in the dimethyl dichlorosilane hydrolysate is relatively high, and methods for reducing the content of residual chlorine in the dimethyl dichlorosilane hydrolysate generally comprise an alkali washing method, a water vapor treatment method, a multi-stage continuous hydrolysis method and an adsorption treatment method. The alkali washing method is a method which is applied more generally, quickly and economically at home and abroad at present.
The alkali washing method in the prior organic silicon production is to wash the hydrolysis product of the dimethyldichlorosilane by using inorganic alkali liquor so as to remove residual chlorine in the hydrolysis product of the dimethyldichlorosilane and obtain alkali liquor containing chlorine salt. When the alkali concentration in the alkali liquor is low, the hydrolysis product of the dimethyldichlorosilane can not be washed any more, so that the alkali liquor needs to be discharged.
Disclosure of Invention
The application provides a method and a system for discharging waste alkali liquor in organic silicon production, which are used for solving the problem of waste alkali liquor discharge in the organic silicon production.
In a first aspect, the application provides a method for discharging waste alkali liquor in organic silicon production, which comprises the following steps:
conveying the hydrolysate of the dimethyldichlorosilane into the stirring kettle from the top of the stirring kettle, wherein the hydrolysate of the dimethyldichlorosilane comprises siloxane and a small amount of hydrogen chloride, and pumping inorganic alkali liquor out of an alkali liquor storage tank and into the stirring kettle through a circulating pump, wherein the circulating pump is connected between the alkali liquor storage tank and the stirring kettle.
And mixing the inorganic alkali liquor and the hydrolysate in the stirring kettle by stirring of the stirring kettle so that the inorganic alkali liquor removes hydrogen chloride in the hydrolysate to obtain a mixed liquor.
And inputting the mixed solution into a phase separator, and layering the mixed solution into an upper-layer oil layer and a lower-layer alkali solution layer in the phase separator, wherein the phase separator is connected between an alkali solution storage tank and a stirring kettle.
And inputting the lower-layer alkali liquor into the alkali liquor storage tank so as to pump the inorganic alkali liquor out of the alkali liquor storage tank to the stirring kettle again through a circulating pump, washing hydrogen chloride in the hydrolysate of the dimethyldichlorosilane, and outputting the upper-layer oil layer from the upper part of the phase separator to the next hydrolysis procedure.
The inorganic alkali liquor in the alkali liquor storage tank is tested by acid-base titration to obtain the concentration of the inorganic alkali liquor in the alkali liquor storage tank, the inorganic alkali liquor in the alkali liquor storage tank is waste alkali liquor when the concentration of the inorganic alkali liquor is less than or equal to 2%, and the waste alkali liquor in the alkali liquor storage tank is pumped to the sewage treatment device by connecting the alkali liquor storage tank with a sewage pump.
Optionally, the top of the alkali liquor storage tank is further provided with an inorganic alkali liquor input port, wherein the inorganic alkali liquor input port is different from the ports connected with the alkali liquor storage tank and the phase separator.
Optionally, before inorganic alkali liquor is pumped out from the alkali liquor storage tank and pumped into the stirred tank through the circulating pump, the method further comprises:
and inputting the inorganic alkali liquor with the mass concentration of 8-15% into an alkali liquor storage tank from an inorganic alkali liquor input port.
Optionally, the temperature of the hydrolysate of dimethyldichlorosilane input into the stirring kettle is 90 ℃, and a jacket is sleeved outside the stirring kettle;
the method further comprises the following steps:
steam from outside the stirred tank was passed into the jacket so that the steam heated the mixture to 90 ℃ in the stirred tank.
Optionally, the lower end of the jacket is provided with a condensate outlet, and condensate formed by condensing water vapor is discharged outwards through the condensate outlet.
Optionally, the flow rate of the hydrolysate of dimethyldichlorosilane to the stirred tank is 12.1m3The flow rate of the inorganic alkali liquor pumped by the circulating pump to the stirring kettle is 151m3/h，
The flow rate of the sewage pump is 20m3/h。
Optionally, the phase separator is connected with the bottom of the stirring kettle, and the alkali liquor storage tank is connected with the bottom of the phase separator.
Optionally, the circulating pump is connected with the top of the stirring kettle and used for pumping the inorganic alkali liquor into the stirring kettle from the top of the stirring kettle.
Optionally, a connection port for connecting the alkali liquor storage tank and the circulating pump, and a connection port for connecting the alkali liquor storage tank and the sewage pump are arranged at different positions.
Optionally, the inorganic alkali solution comprises one or more of the following: sodium hydroxide, potassium hydroxide, sodium carbonate.
In a second aspect, the present application provides a blowdown system of waste lye in organosilicon production, including: alkali liquor storage tank, stirred tank, phase separator, circulating pump, dredge pump and sewage treatment plant.
The circulating pump is connected between alkali lye storage tank and stirred tank, and the phase separator is connected between alkali lye storage tank and stirred tank, and the dredge pump is connected between alkali lye storage tank and sewage treatment plant.
The alkali liquor storage tank is used for storing inorganic alkali liquor; the circulating pump is used for pumping the inorganic alkali liquor out of the alkali liquor storage tank and pumping the inorganic alkali liquor into the stirring kettle.
And the stirring kettle is used for stirring to mix the inorganic alkali liquor and the hydrolysate of the dimethyldichlorosilane so as to remove hydrogen chloride in the hydrolysate by the inorganic alkali liquor and obtain mixed liquor.
And the phase separator is used for inputting the mixed liquid from the stirring kettle, layering the mixed liquid into an upper-layer oil layer and a lower-layer alkali liquid layer, and inputting the lower-layer alkali liquid layer into the alkali liquid storage tank.
And the sewage pump is used for starting when the concentration of the alkali liquor in the alkali liquor storage tank is less than or equal to 2 percent and pumping the inorganic alkali liquor with the concentration of less than or equal to 2 percent in the alkali liquor storage tank to the sewage treatment device.
Optionally, the alkali liquor storage tank is further provided with an inorganic alkali liquor input port, the inorganic alkali liquor input port is used for inputting 8% -15% inorganic alkali liquor, and the inorganic alkali liquor input port is different from a port where the alkali liquor storage tank and the phase separator are connected.
Optionally, the temperature of the hydrolysate of dimethyldichlorosilane input into the stirring kettle is 90 ℃, and a jacket is sleeved outside the stirring kettle.
The jacket was used to admit steam from the outside of the stirred tank so that the steam would heat the mixture to 90 ℃ in the stirred tank.
Optionally, the lower end of the jacket is provided with a condensate outlet for discharging condensate formed by condensing water vapor outwards.
Optionally, the phase separator is connected with the bottom of the stirring kettle, and the alkali liquor storage tank is connected with the bottom of the phase separator.
Optionally, the circulating pump is connected with the top of the stirring kettle and used for pumping the inorganic alkali liquor into the stirring kettle from the top of the stirring kettle.
Optionally, the connection port that alkali lye storage tank and circulating pump are connected to and, the connection port setting that alkali lye storage tank and dredge pump are connected is in different positions.
The application provides a blowdown method and system of waste alkali lye in organosilicon production, realized carrying out the purpose to the waste alkali lye blowdown to the in-process that the alkali washed dimethyl dichlorosilane hydrolysate, and through setting up two pumps in this scheme, one is used for the circulating pump to pump inorganic alkali lye to the stirred tank in, and another is used for the dredge pump to pump waste alkali lye to sewage treatment device. Compare in only setting up a pump (for the circulating pump), this circulating pump not only pumps inorganic alkali lye to the stirred tank in, still pumps waste alkali lye to sewage treatment device, causes the circulating pump long-term operation under the big circumstances of lift, and the power of circulating pump is big on the left, causes energy loss easily. The scheme of this application adopts and sets up two pumps, and the circulating pump need not to go into waste lye pump to sewage treatment device, can reduce the lift of circulating pump to guarantee that the circulating pump can satisfy the working requirement and also can work under lower power, saved the energy consumption.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a flow chart of a method for discharging waste lye in the production of organic silicon according to an embodiment of the present application;
FIG. 2 is a schematic structural diagram of a drainage system for waste lye in the production of organic silicon according to an embodiment of the present application;
FIG. 3 is a schematic structural diagram of a drainage system for waste lye in the production of organic silicon according to another embodiment of the present application;
FIG. 4 is a schematic structural diagram of a blowdown system of spent lye in organosilicon production provided by a comparative example of the present application.
Description of reference numerals:
210: an alkali liquor storage tank;
2101: an inorganic alkali liquor input port;
220: stirring the mixture in a kettle;
230: a phase separator;
240: a circulation pump;
250: a sewage pump;
260: a sewage treatment device;
2201: a jacket;
2202: a water vapor inlet;
2203: a condensate outlet;
2301: an outlet of the alkali liquor layer;
2302: and (4) an oil layer outlet.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application are clearly and completely described below, and it is obvious that the described embodiments are a part of the embodiments of the present application, but not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Fig. 1 is a flowchart of a method for draining waste lye in organic silicon production provided in an embodiment of the present application, and fig. 2 is a schematic structural diagram of a system for draining waste lye in organic silicon production provided in an embodiment of the present application, and as shown in fig. 1 and fig. 2, the method of this embodiment may include:
the method of this embodiment can be applied to the system for draining waste alkali liquid in organic silicon production shown in fig. 2, and the system for draining waste alkali liquid in organic silicon production of this embodiment includes: the device comprises an alkali liquor storage tank 210, a stirring kettle 220, a phase separator 230, a circulating pump 240, a sewage disposal pump 250 and a sewage disposal device 260, wherein the circulating pump 240 is connected between the alkali liquor storage tank 210 and the stirring kettle 220, the phase separator 230 is connected between the alkali liquor storage tank 210 and the stirring kettle 220, and the sewage disposal pump 250 is connected between the alkali liquor storage tank 210 and the sewage disposal device 260. The lye storage tank 210 is used for storing inorganic lye, and the circulating pump 240 is used for pumping the inorganic lye out of the lye storage tank 210 and pumping the inorganic lye into the stirred tank 220.
S101, conveying the hydrolysate of the dimethyldichlorosilane into the stirring kettle from the top of the stirring kettle, and pumping the inorganic alkali liquor out of the alkali liquor storage tank and into the stirring kettle through a circulating pump.
Specifically, the hydrolysate of dimethyldichlorosilane is conveyed into the stirred tank 220 from the top of the stirred tank 220, and the circulating pump 240 is turned on, and the inorganic alkali liquor is pumped out of the alkali liquor storage tank 210 and pumped into the stirred tank 220 by the circulating pump 240 under the working state of the circulating pump 240.
S102, mixing the inorganic alkali liquor and the hydrolysate in the stirring kettle by stirring of the stirring kettle so that the inorganic alkali liquor removes hydrogen chloride in the hydrolysate to obtain a mixed liquor.
Wherein, stirred tank 220 is used for stirring and makes inorganic alkali liquid and dimethyl dichlorosilane's hydrolysate mix in stirred tank 220, so opens stirred tank 220, and inorganic alkali liquid mixes with the hydrolysate under stirred tank 220's stirring effect for inorganic alkali liquid removes the hydrogen chloride in the hydrolysate, thereby obtains the mixed solution.
And S103, inputting the mixed solution into a phase separator, and layering the mixed solution into an upper oil layer and a lower alkali liquid layer in the phase separator.
S104, inputting the lower-layer alkali liquor into the alkali liquor storage tank so as to pump the inorganic alkali liquor out of the alkali liquor storage tank again to the stirring kettle through the circulating pump.
The phase separator 230 is configured to input the mixed solution from the stirred tank 220, separate the mixed solution into an upper oil layer and a lower alkali solution layer, and input the lower alkali solution layer into the alkali solution storage tank 210.
Specifically, after the mixed liquid is obtained in the stirred tank 220, the mixed liquid is fed from the stirred tank 220 to the phase separator 230, and the mixed liquid is separated into two layers in the phase separator 230, the upper layer being an oil layer (containing a hydrolysate of dimethyldichlorosilane) and the lower layer being an alkali liquid layer (containing inorganic alkali liquid and chloride). The phase separator 230 is further provided with an alkali liquor layer outlet 2301, then the lower alkali liquor layer obtained by layering is input into the alkali liquor storage tank 210 from the alkali liquor layer outlet 2301, the alkali liquor in the alkali liquor storage tank 210 can be pumped into the stirring kettle 220 again through the circulating pump 240, so that hydrogen chloride in the hydrolysate can be removed for multiple times, and the purpose of recycling the alkali liquor in the alkali liquor storage tank 210 for multiple times is achieved.
Optionally, the phase separator 230 is further provided with an oil layer outlet 2302, and accordingly, the method of this embodiment may further output the upper oil layer from the oil layer outlet 2302 of the phase separator 230 to be input to the next process (such as a water washing process, etc.) of the hydrolysate of dimethyldichlorosilane.
S105, when the concentration of the inorganic alkali liquor in the alkali liquor storage tank is less than or equal to 2%, pumping the inorganic alkali liquor with the concentration of less than or equal to 2% in the alkali liquor storage tank to a sewage treatment device through a sewage pump.
Wherein, the sewage pump 250 is used for pumping the inorganic alkali liquor in the alkali liquor storage tank 210 to the sewage treatment device 260.
Specifically, the concentration of the inorganic alkali liquor in the alkali liquor storage tank 210 is detected by an acid-base titration method to obtain the concentration of the inorganic alkali liquor in the alkali liquor storage tank 210, and when the concentration of the inorganic alkali liquor in the alkali liquor storage tank 210 is less than or equal to 2%, it indicates that the inorganic alkali liquor in the alkali liquor storage tank 210 can no longer be used for removing hydrogen chloride in the hydrolysate, and at this time, the inorganic alkali liquor in the alkali liquor storage tank 210 can be called waste alkali liquor and needs to be discharged, so the circulating pump 240 can be turned off, the sewage pump 250 is turned on, the sewage pump 250 pumps the inorganic alkali liquor with the concentration of less than or equal to 2% in the alkali liquor storage tank 210 to the sewage treatment device 260, the sewage treatment device 260 treats the inorganic alkali liquor with the concentration of less than or equal to 2% as sewage, and discharges the sewage after the inorganic alkali liquor meets the environmental protection requirements after treatment. Wherein the waste alkali liquor comprises inorganic alkali liquor with the concentration less than or equal to 2%, chlorine salt, a small amount of hydrolysis products of dimethyldichlorosilane and the like.
Through above-mentioned scheme, realized carrying out the purpose to the waste lye blowdown to the in-process that the alkali washed to dimethyl dichlorosilane hydrolysate, through setting up two pumps in this scheme moreover, one is used for the circulating pump to go into inorganic alkali lye pump to stirred tank in, and another is used for going into waste alkali lye pump to sewage treatment device for the dredge pump. If only set up a pump (for the circulating pump), this circulating pump not only with inorganic alkali lye pump income still with waste lye pump income to sewage treatment device in to the stirred tank, because the distance between alkali lye storage tank and the sewage treatment device is far away, make the lift of circulating pump need set up the increase, and most of time circulating pump work is being gone into inorganic alkali lye pump extremely stirred tank in, and the distance between inorganic alkali lye and the stirred tank is nearer, this can cause the circulating pump long-term operation under the big circumstances of lift, the power of circulating pump also can be bigger than normal, cause energy loss. Consequently, the scheme of this application adopts and sets up two pumps, and the circulating pump need not to go into waste lye pump to sewage treatment device to can reduce the lift of circulating pump, in order to guarantee that the circulating pump can satisfy the working requirement and also can work under lower power, saved the energy consumption.
Optionally, the top of the lye storage tank 210 is further provided with an inorganic lye input port 2101, the inorganic lye input port 2101 is used to input inorganic lye to the lye storage tank 210 before the hydrolysis product of dimethyldichlorosilane is subjected to alkali washing, wherein the inorganic lye input port 2101 is different from the ports connected to the lye storage tank 210 and the phase separator 230.
Optionally, before the inorganic alkali solution is pumped out of the alkali solution storage tank 210 by the circulating pump 240 and pumped into the stirring kettle 220, the method further comprises:
inputting the inorganic alkali liquor with the mass concentration of 8% -15% into the alkali liquor storage tank 210 from the inorganic alkali liquor input port 2101.
Optionally, the inorganic lye comprises one or more of: sodium hydroxide, potassium hydroxide, sodium carbonate.
Specifically, the hydrolysate of the dimethyldichlorosilane contains a small amount of hydrogen chloride, and the hydrogen chloride in the hydrolysate is subjected to acid-base neutralization reaction by adding an inorganic alkali solution to generate a chloride salt so as to remove chlorine in the hydrolysate.
Alternatively, the temperature of the hydrolysate of dimethyldichlorosilane fed into the stirred tank 220 is 90 ℃.
Fig. 3 is a schematic structural diagram of a drainage system for waste lye in organosilicon production according to another embodiment of the present application, as shown in fig. 3, a jacket 2201 is sleeved outside the stirred tank 220, and the method of this embodiment further includes introducing steam from outside the stirred tank 220 into the jacket 2201, so that the steam heats the mixed solution in the stirred tank 220 to 90 ℃.
Specifically, the stirred tank 220 is used for stirring to mix the inorganic alkali solution and the hydrolysate of dimethyldichlorosilane in the stirred tank 220, so that the stirred tank 220 is started and the inorganic alkali solution and the hydrolysate are mixed under the stirring action of the stirred tank 220. The upper part of the jacket 2201 is provided with a water vapor inlet 2202, in this embodiment, water vapor from the outside of the stirred tank 220 is introduced into the jacket 2201 through the water vapor inlet 2202, so that the mixed liquid is heated in the stirred tank 220 by the water vapor, the mixed liquid in the stirred tank 220 is heated to 90 ℃ by the water vapor through the jacket 2201, and the rate of removing hydrogen chloride in the hydrolysate by the inorganic alkali liquor can be accelerated at this temperature, so as to obtain the mixed liquid.
Optionally, the lower part of clamp cover 2201 is provided with lime set export 2203, and the mixed liquid in stirred tank 220 is heated after condensing and is formed the lime set to vapor, through the lime set export 2203 outside discharge vapor condensation formed lime set for clamp cover 2201 can continuously let in vapor, guarantees to mix the liquid and continuously heats.
Optionally, the flow rate of the hydrolysate of dimethyldichlorosilane to the stirred tank 220 is 12.1m3The flow rate of the inorganic alkali liquor pumped by the circulating pump 240 to the stirring kettle 220 is 151m3H; the sewage pump 250 has a flow rate of 20m3H is used as the reference value. Therefore, the circulating pump works under lower power, and energy consumption is saved.
Optionally, the phase separator 230 is connected to the bottom of the stirred tank 220, so that the mixture in the stirred tank 220 can smoothly flow into the phase separator 230. The lye storage tank 210 is connected with the bottom of the phase separator 230 so that the lower layer lye layer of the phase separator 230 can smoothly flow into the lye storage tank 210.
Optionally, the circulating pump 240 is connected to the top of the stirred tank 220, and is used for pumping the inorganic alkali solution into the stirred tank 220 at the top of the stirred tank 220, and the inorganic alkali solution flows into the bottom from the top, so that the inorganic alkali solution is mixed with the hydrolysate of dimethyldichlorosilane.
Optionally, a connection port for connecting the lye storage tank 210 and the circulating pump 240, and a connection port for connecting the lye storage tank 210 and the sewage pump 250 are disposed at different positions. Therefore, when the inorganic alkali liquor needs to be pumped into the stirring kettle 220, the circulating pump 240 is started, and when the waste alkali liquor needs to be pumped into the sewage treatment device 260, the sewage pump 250 is started, so that the operation of personnel is facilitated.
Optionally, a connection port for connecting the lye storage tank 210 and the circulation pump 240, and a connection port for connecting the lye storage tank 210 and the sewage pump 250 are provided at the same position. When the inorganic alkali liquor needs to be pumped into the stirring kettle 220, the circulating pump 240 is connected with the connecting port, the circulating pump 240 is started again, when the waste alkali liquor needs to be pumped into the sewage treatment device 260, the sewage pump 250 is connected with the connecting port, and the sewage pump 250 is started again.
The technical solution of the present application is illustrated in detail by the following specific examples.
Example 1
In the method and the system for discharging waste alkali liquor in organic silicon production in the embodiment, the operation flow during specific work is as follows:
the hydrolysate of dimethyldichlorosilane was stirred at 12.1m from the top of the stirred tank3The flow rate of the sodium hydroxide solution is conveyed into the stirring kettle, and the sodium hydroxide solution with the mass fraction of 8 percent is pumped out of the alkali solution storage tank by a circulating pump and is 151m3The flow rate/h was pumped into the stirred tank, the head of the circulation pump was 55m (determined from the distance between the lye tank and the stirred tank in example 1). Wherein, the circulating pump is connected between the alkali liquor storage tank and the stirring kettle, and the sodium hydroxide alkali liquor and the hydrolysate are mixed in the stirring kettle to obtain mixed liquor. The jacket is sleeved outside the stirring kettle and used for introducing steam from the outside of the stirring kettle so as to heat the mixed liquid in the stirring kettle to 90 ℃, and the sodium hydroxide alkali liquor is used for removing hydrogen chloride in the hydrolysate in the stirring kettle, wherein the lower end of the jacket is provided with a condensate outlet which is used for discharging condensate formed by condensing the steam outwards.
And inputting the mixed solution into a phase separator, and layering the mixed solution into an upper-layer oil layer and a lower-layer alkali solution layer in the phase separator, wherein the phase separator is connected between an alkali solution storage tank and a stirring kettle, and the phase separator is connected with the bottom of the stirring kettle.
The alkali liquor storage tank is connected with the bottom of the phase separator, the lower layer alkali liquor is input into the alkali liquor storage tank, so that the sodium hydroxide alkali liquor is pumped out of the alkali liquor storage tank to the stirring kettle again through the circulating pump, hydrogen chloride in a hydrolysate of the dimethyldichlorosilane is washed, and an upper oil layer is output to a next hydrolysis procedure from an upper oil layer output port of the phase separator.
Detect sodium hydroxide alkali lye in the alkali lye storage tank through acid-base titration in order to obtain the concentration of sodium hydroxide alkali lye in the alkali lye storage tank, when the concentration of sodium hydroxide alkali lye in the alkali lye storage tank was less than or equal to 2%, the hydrogen chloride in the hydrolysate of dimethyldichlorosilane can not be washed to sodium hydroxide alkali lye, is waste alkali lye, through being connected alkali lye storage tank and dredge pump, with the waste alkali lye pump-sending in the alkali lye storage tank to sewage treatment plant, the flow of dredge pump is 20m3H, the lift is 34 m.
Example 2
In the method and the system for discharging waste alkali liquor in organic silicon production in the embodiment, the operation flow during specific work is as follows:
the hydrolysate of dimethyldichlorosilane was stirred at 12.1m from the top of the stirred tank3The flow rate of the sodium carbonate solution is/h, the sodium carbonate solution with the mass fraction of 15 percent is pumped out of the alkali liquor storage tank through a circulating pump and is 151m3The flow rate/h was pumped into the stirred tank, the head of the circulation pump was 45m (determined from the distance between the lye tank and the stirred tank in example 2). Wherein, the circulating pump is connected between the alkali liquor storage tank and the stirring kettle, and the sodium carbonate alkali liquor and the hydrolysate are mixed in the stirring kettle to obtain mixed liquor. The jacket is sleeved outside the stirring kettle and used for introducing water vapor from the outside of the stirring kettle so as to heat the mixed solution to 90 ℃ in the stirring kettle, and hydrogen chloride in the hydrolysate is removed from the sodium carbonate alkali solution in the stirring kettle, wherein the lower end of the jacket is provided with a condensate outlet which is used for discharging condensate formed by condensing the water vapor outwards.
And inputting the mixed solution into a phase separator, and layering the mixed solution into an upper-layer oil layer and a lower-layer alkali solution layer in the phase separator, wherein the phase separator is connected between an alkali solution storage tank and a stirring kettle, and the phase separator is connected with the bottom of the stirring kettle.
The alkali liquor storage tank is connected with the bottom of the phase separator, the lower alkali liquor is input into the alkali liquor storage tank, so that the sodium carbonate alkali liquor is pumped out of the alkali liquor storage tank to the stirring kettle again through the circulating pump, hydrogen chloride in the hydrolysate of the dimethyldichlorosilane is washed, and the upper oil layer is output to the next hydrolysis procedure from an upper oil layer output port of the phase separator.
Detect sodium carbonate alkali lye in the alkali lye storage tank through acid-base titration in order to obtain the concentration of sodium carbonate alkali lye in the alkali lye storage tank, when the concentration of sodium hydroxide alkali lye in the alkali lye storage tank was less than or equal to 2%, sodium carbonate alkali lye can not wash the hydrogen chloride in the hydrolysate of dimethyldichlorosilane, is waste lye, through being connected alkali lye storage tank and dredge pump, with waste lye pump pumping to sewage treatment plant in the alkali lye storage tank, the flow of dredge pump is 20m3H, the lift is 34 m.
Example 3
In the method and the system for discharging waste alkali liquor in organic silicon production in the embodiment, the operation flow during specific work is as follows:
the hydrolysate of dimethyldichlorosilane was stirred at 12.1m from the top of the stirred tank3The flow rate of the sodium hydroxide solution is conveyed into the stirring kettle, and the sodium hydroxide solution with the mass fraction of 10 percent is pumped out of the alkali solution storage tank by a circulating pump and is 151m3The flow rate/h was pumped into the stirred tank, the head of the circulation pump was 40m (determined from the distance between the lye tank and the stirred tank in example 3). Wherein, the circulating pump is connected between the alkali liquor storage tank and the stirring kettle, and the sodium hydroxide alkali liquor and the hydrolysate are mixed in the stirring kettle to obtain mixed liquor. The outer part of the stirring kettle is sleeved with a jacket, the jacket is used for introducing water vapor from the outer part of the stirring kettle so as to heat the mixed solution to 90 ℃ in the stirring kettle, the sodium hydroxide lye is used for removing hydrogen chloride in the hydrolysate in the stirring kettle, wherein the lower end of the jacketAnd a condensate outlet is arranged and used for discharging condensate formed by condensing water vapor outwards.
And inputting the mixed solution into a phase separator, and layering the mixed solution into an upper-layer oil layer and a lower-layer alkali solution layer in the phase separator, wherein the phase separator is connected between an alkali solution storage tank and a stirring kettle, and the phase separator is connected with the bottom of the stirring kettle.
The alkali liquor storage tank is connected with the bottom of the phase separator, the lower layer alkali liquor is input into the alkali liquor storage tank, so that the sodium hydroxide alkali liquor is pumped out of the alkali liquor storage tank to the stirring kettle again through the circulating pump, hydrogen chloride in a hydrolysate of the dimethyldichlorosilane is washed, and an upper oil layer is output to a next hydrolysis procedure from an upper oil layer output port of the phase separator.
Detect sodium hydroxide alkali lye in the alkali lye storage tank through acid-base titration in order to obtain the concentration of sodium hydroxide alkali lye in the alkali lye storage tank, when the concentration of sodium hydroxide alkali lye in the alkali lye storage tank was less than or equal to 2%, the hydrogen chloride in the hydrolysate of dimethyldichlorosilane can not be washed to sodium hydroxide alkali lye, is waste alkali lye, through being connected alkali lye storage tank and dredge pump, with the waste alkali lye pump-sending in the alkali lye storage tank to sewage treatment plant, the flow of dredge pump is 20m3H, the lift is 34 m.
Example 4
In the method and the system for discharging waste alkali liquor in organic silicon production in the embodiment, the operation flow during specific work is as follows:
the hydrolysate was stirred at 12.1m from the top of the stirred tank3The flow rate of the sodium carbonate solution is conveyed into the stirring kettle, and the sodium carbonate solution with the mass fraction of 12 percent is pumped out of the alkali liquor storage tank by a circulating pump and is 151m3The flow rate/h was pumped into the stirred tank, the head of the circulation pump was 25m (determined from the distance between the lye tank and the stirred tank in example 4). Wherein, the circulating pump is connected between the alkali liquor storage tank and the stirring kettle, and the sodium carbonate alkali liquor and the hydrolysate are mixed in the stirring kettle to obtain mixed liquor. The outer part of the stirring kettle is sleeved with a jacket which is used for introducing water vapor from the outer part of the stirring kettle so as to heat the mixed solution in the stirring kettle to 90 ℃,and removing hydrogen chloride in the hydrolysate by using sodium carbonate alkali liquor in the stirring kettle, wherein the lower end of the jacket is provided with a condensate outlet, and the condensate outlet is used for discharging condensate formed by condensing water vapor outwards.
And inputting the mixed solution into a phase separator, and layering the mixed solution into an upper-layer oil layer and a lower-layer alkali solution layer in the phase separator, wherein the phase separator is connected between an alkali solution storage tank and a stirring kettle, and the phase separator is connected with the bottom of the stirring kettle.
The alkali liquor storage tank is connected with the bottom of the phase separator, the lower alkali liquor is input into the alkali liquor storage tank, so that the sodium carbonate alkali liquor is pumped out of the alkali liquor storage tank to the stirring kettle again through the circulating pump, hydrogen chloride in the hydrolysate of the dimethyldichlorosilane is washed, and the upper oil layer is output to the next hydrolysis procedure from an upper oil layer output port of the phase separator.
Detecting sodium carbonate alkali liquor in an alkali liquor storage tank through acid-base titration to obtain the concentration of the sodium carbonate alkali liquor in the alkali liquor storage tank, wherein when the concentration of the sodium carbonate alkali liquor in the alkali liquor storage tank is less than or equal to 2%, the sodium carbonate alkali liquor cannot wash hydrogen chloride in a hydrolysate of dimethyl dichlorosilane, namely the waste alkali liquor is used as a waste alkali liquor, connecting an alkali liquor storage tank with a sewage pump, pumping the waste alkali liquor in the alkali liquor storage tank to a sewage treatment device, and enabling the flow of the sewage pump to be 20m3H, the lift is 34 m.
Comparative example 1
In the method and the system for discharging waste alkali liquor in organic silicon production in the embodiment, the operation flow during specific work is as follows:
hydrolyzing the dimethyl dichlorosilane hydrolysate which has been subjected to the hydrolysis step and has a temperature of 90 ℃ at a rate of 12.1m from the top of the stirring kettle3The flow rate of the sodium hydroxide solution is conveyed into the stirring kettle, and the sodium hydroxide solution with the mass fraction of 8 percent is pumped out of the alkali solution storage tank by a circulating pump and is 151m3The flow of the circulating pump is pumped into the stirring kettle, and the lift of the circulating pump is 70m (determined according to the distance between the alkali liquor storage tank and the sewage treatment device). Wherein, the circulating pump is connected between the alkali liquor storage tank and the stirring kettle, and the sodium hydroxide alkali liquor and the hydrolysate are mixed in the stirring kettle to obtain mixed liquor. Stirring deviceThe jacket is sleeved outside the stirring kettle and used for introducing steam from the outside of the stirring kettle so as to heat the mixed solution in the stirring kettle to 90 ℃, and hydrogen chloride in a hydrolysate is removed from sodium hydroxide alkali liquor in the stirring kettle, wherein the lower end of the jacket is provided with a condensate outlet which is used for discharging condensate formed by condensing the steam outwards.
And inputting the mixed solution into a phase separator, and layering the mixed solution into an upper-layer oil layer and a lower-layer alkali solution layer in the phase separator, wherein the phase separator is connected between an alkali solution storage tank and a stirring kettle, and the phase separator is connected with the bottom of the stirring kettle.
The alkali liquor storage tank is connected with the bottom of the phase separator, the lower layer alkali liquor is input into the alkali liquor storage tank, so that the sodium hydroxide alkali liquor is pumped out of the alkali liquor storage tank to the stirring kettle again through the circulating pump, hydrogen chloride in a hydrolysate of the dimethyldichlorosilane is washed, and an upper oil layer is output to a next hydrolysis procedure from an upper oil layer output port of the phase separator.
And detecting the sodium hydroxide alkali liquor in the alkali liquor storage tank through acid-base titration to obtain the concentration of the sodium hydroxide alkali liquor in the alkali liquor storage tank, wherein when the concentration of the sodium hydroxide alkali liquor in the alkali liquor storage tank is less than or equal to 2%, the sodium hydroxide alkali liquor cannot wash hydrogen chloride in a hydrolysate of the dimethyldichlorosilane, and the waste alkali liquor is obtained. FIG. 4 is a schematic structural diagram of a drainage system for waste lye in organic silicon production according to the comparative example of the present application, as shown in FIG. 4, the circulation pump is used to circulate the waste lye in the lye storage tank at a flow rate of 151m3The flow rate of the/h is pumped to a sewage treatment device.
Wherein, the lift of the sewage pump in the above embodiments 1 to 4 is determined according to the distance between the lye storage tank and the sewage treatment device, and the distances between the lye storage tank and the sewage treatment device in each embodiment are different. Wherein, the distance between the alkali liquor storage tank and the sewage treatment device in the examples 1 to 4 is the same as that between the alkali liquor storage tank and the sewage treatment device in the comparative example 1.
The power calculation method of the circulating pump comprises the following steps
Wherein Q is the flow of the pump, H is the pump lift, rho is the density of the alkali liquor, g is the acceleration of gravity,
is the efficiency of the pump. The energy saving rate xi of the circulating pump was calculated by calculating the percentage of the decrease in the output power of the circulating pump in examples 1 to 4 as compared with the output power of the circulating pump in comparative example 1, and the final formula was calculated as xi ═ 1-H2/H1In which H is1The head of the circulating pump in comparative example 1 is shown, H2The head of the circulation pump in the embodiment is shown. The present application calculates the energy saving ratio of the circulation pumps in the above examples 1 to 4 with respect to the circulation pump in comparative example 1, and the results are shown in table one.
Watch 1
| Circulating pump head (m) | Alkali liquor | Concentration of alkali liquor | Energy saving ratio (%) | |
| Example 1 | 55 | Sodium hydroxide | 8％ | 21.4％ |
| Example 2 | 45 | Sodium carbonate | 15％ | 35.7％ |
| Example 3 | 40 | Sodium hydroxide | 10％ | 42.9％ |
| Example 4 | 25 | Sodium carbonate | 12％ | 64.3％ |
| Comparative example 1 | 70 | Sodium hydroxide | 8％ | - |
Through the scheme of each embodiment, the application has the following beneficial effects:
(1) the application realizes the washing of the hydrogen chloride in the hydrolysate of the dimethyldichlorosilane and the pollution discharge treatment of the waste alkali liquor, and compared with the prior art (comparative example 1), the method reduces the lift of the circulating pump and saves the energy of the circulating pump.
(2) The circulating pump does not need to convey waste lye, so that the lift is reduced, and the energy consumption of the circulating pump is greatly reduced.
(3) The process is convenient to operate, reduces the production cost and is easy to realize industrialization.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art; the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. A method for discharging waste alkali liquor in organic silicon production is characterized by comprising the following steps:
conveying a hydrolysate of the dimethyldichlorosilane into a stirring kettle, and pumping inorganic alkali liquor out of an alkali liquor storage tank and into the stirring kettle through a circulating pump, wherein the circulating pump is connected between the alkali liquor storage tank and the stirring kettle;
mixing the inorganic alkali liquor and the hydrolysate in the stirring kettle by stirring of the stirring kettle so that the inorganic alkali liquor removes hydrogen chloride in the hydrolysate to obtain a mixed solution;
inputting the mixed solution into a phase separator, and layering the mixed solution into an upper-layer oil layer and a lower-layer alkali solution layer in the phase separator, wherein the phase separator is connected between the alkali solution storage tank and the stirring kettle;
inputting the lower layer of alkali liquor into the alkali liquor storage tank so as to pump the inorganic alkali liquor out of the alkali liquor storage tank to the stirring kettle again through the circulating pump;
when the concentration of the inorganic alkali liquor in the alkali liquor storage tank is less than or equal to 2%, the inorganic alkali liquor with the concentration of less than or equal to 2% in the alkali liquor storage tank is pumped to a sewage treatment device through a sewage pump.
2. The method of claim 1, wherein the top of the lye storage tank is further provided with an inorganic lye input port, wherein the inorganic lye input port is different from the port to which the lye storage tank and the phase separator are connected;
before the inorganic alkali liquor is pumped out of the alkali liquor storage tank and pumped into the stirring kettle by the circulating pump, the method further comprises the following steps:
and inputting the inorganic alkali liquor with the mass concentration of 8% -15% into the alkali liquor storage tank from the inorganic alkali liquor input port.
3. The method according to claim 1, wherein the temperature of the hydrolysate of methyldichlorosilane fed into the stirring tank is 90 ℃, and a jacket is sleeved on the outer part of the stirring tank;
the method further comprises the following steps:
steam from outside the stirred tank was passed into the jacket so that the steam heated the mixture to 90 ℃ in the stirred tank.
4. A method according to claim 3, wherein the lower end of the jacket is provided with a condensate outlet;
the method further comprises the following steps:
and discharging the condensed liquid formed by condensing the water vapor outwards through the condensed liquid outlet.
5. The method as claimed in claim 1, wherein the flow rate of the hydrolysate of dimethyldichlorosilane fed to the stirred tank is 12.1m3The flow rate of the inorganic alkali liquor pumped by the circulating pump to the stirring kettle is 151m3/h；
The flow of the sewage pump is 20m3/h。
6. The method of claim 1, wherein the phase separator is connected to the bottom of the stirred tank and the lye storage tank is connected to the bottom of the phase separator.
7. The method according to claim 1, wherein the circulating pump is connected with the top of the stirred tank and is used for pumping the inorganic alkali liquor into the stirred tank at the top of the stirred tank.
8. The method of claim 1, wherein the connection port for the lye storage tank and the circulation pump and the connection port for the lye storage tank and the dredge pump are provided at different locations.
9. The method of claim 1, wherein the inorganic lye comprises one or more of: sodium hydroxide, potassium hydroxide, sodium carbonate.
10. A blowdown system of waste lye in organosilicon production, characterized by, includes: an alkali liquor storage tank, a stirring kettle, a phase separator, a circulating pump, a sewage pump and a sewage treatment device;
the circulating pump is connected between the alkali liquor storage tank and the stirring kettle, the phase separator is connected between the alkali liquor storage tank and the stirring kettle, and the sewage pump is connected between the alkali liquor storage tank and the sewage treatment device;
the alkali liquor storage tank is used for storing inorganic alkali liquor; the circulating pump is used for pumping inorganic alkali liquor out of the alkali liquor storage tank and pumping the inorganic alkali liquor into the stirring kettle;
the stirring kettle is used for stirring to mix the inorganic alkali liquor and a hydrolysate of the dimethyldichlorosilane in the stirring kettle so as to remove hydrogen chloride in the hydrolysate by the inorganic alkali liquor and obtain a mixed liquor;
the phase separator is used for inputting the mixed liquid from the stirring kettle, enabling the mixed liquid to be layered into an upper-layer oil layer and a lower-layer alkali liquid layer, and inputting the lower-layer alkali liquid layer into the alkali liquid storage tank;
and the sewage pump is used for starting when the concentration of the inorganic alkali liquor in the alkali liquor storage tank is less than or equal to 2 percent and pumping the inorganic alkali liquor with the concentration of less than or equal to 2 percent in the alkali liquor storage tank to the sewage treatment device.
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