CN102847372A - Filtering method of sodium bichromate carbonizing liquid - Google Patents
Filtering method of sodium bichromate carbonizing liquid Download PDFInfo
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- CN102847372A CN102847372A CN2012103554541A CN201210355454A CN102847372A CN 102847372 A CN102847372 A CN 102847372A CN 2012103554541 A CN2012103554541 A CN 2012103554541A CN 201210355454 A CN201210355454 A CN 201210355454A CN 102847372 A CN102847372 A CN 102847372A
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- sodium dichromate
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Abstract
The invention relates to a filtering method of sodium bichromate carbonizing liquid. The filtering method comprises the following steps: preparing sodium bichromate carbonizing liquid; and filtering the sodium bichromate carbonizing liquid under a condition that a preset pressure is kept. With the adoption of the filtering method of sodium bichromate carbonizing liquid provided by the invention, the sodium bichromate carbonizing liquid which is subjected to qualified carbonizing does not generate reverse reaction due to the reduction of the pressure.
Description
Technical field
The present invention relates to chemical field, relate in particular to a kind of filter method of sodium dichromate carbodiimide solution.
Background technology
Sodium dichromate (sodium dichromate) is important basic chemical industry raw material, mainly for the production of chemical products such as chromic anhybride, chrome yellow, chrome oxide green and potassium bichromates.In printing and dyeing industry, electroplating industry and leather industry, make auxiliary agent, in a lot of chemical industry, be used as oxidant, use very extensive.
Denomination of invention at length discloses the method that replaces sulfuric acid acidation to produce sodium dichromate with carbon dioxide for the Chinese invention patent CN101693556A of " a kind of preparation method of sodium dichromate ", and the integral body of this patent is incorporated by reference this paper.But, adopt common filtration means to filter the sodium dichromate carbodiimide solution in the method for this patent, this may cause the sodium dichromate carbodiimide solution to produce back reaction, thereby causes filtered carbodiimide solution quality defective, and then reduces the quality of the sodium dichromate for preparing.
Summary of the invention
The invention provides a kind of filter method of sodium dichromate carbodiimide solution, to overcome shortcoming above-mentioned, guarantee that the sodium dichromate carbodiimide solution can not produce back reaction in filter process.
The filter method of sodium dichromate carbodiimide solution provided by the invention comprises: preparation sodium dichromate carbodiimide solution; In the situation that keep predetermined pressure the sodium dichromate carbodiimide solution is filtered.
In a preferred embodiment, comprise in the situation that keep predetermined pressure that the sodium dichromate carbodiimide solution is filtered: in the situation that the maintenance predetermined pressure is delivered to vertical plate and frame filter press by feed pipe with the sodium dichromate carbodiimide solution; In vertical plate and frame filter press, the sodium dichromate carbodiimide solution is filtered; Sodium dichromate carbodiimide solution after will filtering by the filtrate output tube road is delivered to the filtrate storage tank.
In a preferred embodiment, be provided with the filtrate pressure-regulating valve in the filtrate output tube road, keep predetermined pressure by the filtrate pressure-regulating valve.
In a preferred embodiment, predetermined pressure is not less than 0.6MPa.
In a preferred embodiment, be provided with the charging control valve at feed pipe.
In a preferred embodiment, in filter process, adopt compressed air to dry up and the wash water washing process.
In a preferred embodiment, compressed air dries up and the blow gas pressure of wash water washing process is that 0.6MPa, gassing time are 60s-120s.
In a preferred embodiment, in filter process, adopt the high-pressure hydraulic pump extrusion process.
In a preferred embodiment, the high-pressure hydraulic pump pressure of high-pressure hydraulic pump extrusion process is 2.0MPa.
In a preferred embodiment, in the situation that keep after predetermined pressure filters the sodium dichromate carbodiimide solution, thereby also comprising the sodium dichromate carbodiimide solution after filtering processed obtains sodium dichromate.
The advantage of the filter method of sodium dichromate carbodiimide solution of the present invention is: in the situation that keep predetermined pressure that the sodium dichromate carbodiimide solution is filtered, thus guarantee that the sodium dichromate carbodiimide solution back reaction can not occur.For being not less than 0.6MPa, this can reach good filter effect by the predetermined pressure of filtrate pressure-regulating valve control, and the carbodiimide solution that can satisfy again after the filtration is the requirement of certified products.Dry up and the wash water washing process through compressed air, the byproduct sodium acid carbonate chrome content that obtains reduces greatly.Dry up technique through water under high pressure extruding and compressed air, the natrii bicarbonas filter cake water content can be controlled in 10%, so that follow-up use.Adopt the method discharge time of the present invention short, can satisfy the requirement of the sodium dichromate carbodiimide solution being carried out continuous filtration.
Description of drawings
Fig. 1 illustrates in one embodiment of the present of invention the system for the preparation of sodium dichromate.
The specific embodiment
In a specific embodiment, the present invention specifically provides following technical scheme:
At first, sodium dichromate carbodiimide solution with pressure enters vertical plate and frame filter press after the improvement through feed pipe.The improvement of vertical plate compression mainly is to have increased pressure-regulating valve, and its increase is so that in the press filtration pressure release, carbodiimide solution the adverse current phenomenon can not occur and so that filter efficiency reduce.Under the control of filtrate pressure-regulating valve, filter process remains at predetermined pressure.When the pressure in the vertical plate and frame filter press surpasses predetermined pressure, make filtrate flow to the filtrate storage tank by the filtrate output tube road; When arrival end pressure raises, be arranged on the charging control valve autoshutdown on the feed pipe, the filtrate pressure-regulating valve that is arranged on the filtrate output tube road is opened fully, makes filtrate flow to the filtrate storage tank by the filtrate output tube road.Then, open compressed air regulating valve, make under the compressed air effect that residual feed liquid enters vertical plate and frame filter press in the inlet pipeline, thereby avoid line clogging.The closes compression air control valve finished to blow after air blowing arrived setting-up time, then started high-pressure hydraulic pump, vertical sheet frame water of compaction capsule water-filling is expanded, thereby natrii bicarbonas filter cake is extracted; Then stop high-pressure hydraulic pump, open compressed air regulating valve, under compressed-air actuated effect, make the water in the water pocket get back to the water of compaction storage tank, and make filter cake more dried.Afterwards, the closes compression air control valve is opened the wash water control valve, closes the wash water control valve after being filled with a small amount of wash water, then starts high-pressure hydraulic pump, vertical sheet frame water of compaction capsule water-filling is expanded, thereby natrii bicarbonas filter cake is extracted; Then stop high-pressure hydraulic pump, open compressed air regulating valve, under compressed-air actuated effect, make the water in the water pocket get back to the water of compaction storage tank, and make filter cake more dried.So twice afterwards discharging of circulation cleaning, discharging is closed the filtrate pressure-regulating valve after finishing, and enters next filtration cycle thereby open the charging control valve.
Can also comprise following technical characterictic in the technical scheme of the present invention: predetermined pressure is for being not less than 0.6MPa, and blow gas pressure is 0.6MPa, and the air blowing setting-up time is 60s-120s, and high-pressure hydraulic pump pressure is 2.0MPa.
The system for the preparation of sodium dichromate below in conjunction with Fig. 1 is further elaborated the specific embodiment of the present invention.
After carbonization was qualified, pressure was the vertical plate and frame filter press 6 after the sodium dichromate carbodiimide solution process feed pipe of 1.2MPa enters improvement, makes filter process remain at 0.6Mpa under the control of filtrate pressure-regulating valve 8.When the setting value of the pressure overpressure in the vertical plate and frame filter press 6 0.6MPa, by the filtrate output tube road filtrate is transported to filtrate storage tank 9.When arrival end pressure raises, show that this moment, vertical plate and frame filter press 6 was full of the sodium dichromate carbodiimide solution, be arranged on charging control valve 2 autoshutdowns on the feed pipe, the filtrate pressure-regulating valve 8 that is arranged on the filtrate output tube road is opened fully, makes filtrate flow to filtrate storage tank 9.Then open compressed air regulating valve 3, under the compressed air effect, make the vertical plate and frame filter press 6 after residual feed liquid enters improvement in the inlet pipeline, thereby avoid line clogging.Closes compression air control valve 3 finishes to blow after air blowing 1-2 minute, starts high-pressure hydraulic pump 7, and vertical plate and frame filter press 6 extruding water pocket water-fillings expand, and natrii bicarbonas filter cake is extracted.Then stop high-pressure hydraulic pump 7, open compressed air regulating valve 3, under compressed-air actuated effect, make water pocket water get back to water of compaction storage tank 5, compressed air has drying function to filter cake simultaneously, and then closes compression air control valve 3 after air blowing 1-2 minute opens wash water control valve 4, close wash water control valve 4 after being filled with a small amount of wash water, start high-pressure hydraulic pump 7, vertical sheet frame 6 extruding water pocket water-fillings are expanded, natrii bicarbonas filter cake is extracted.Then stop high-pressure hydraulic pump 7, open compressed air regulating valve 4, under compressed-air actuated effect, make water pocket water get back to water of compaction storage tank 5, and filter cake is dried.So twice rear discharging of circulation cleaning.Discharging is closed filtrate pressure-regulating valve 8 after finishing, and enters next filtration cycle thereby open charging control valve 2.
The advantage of the filter method of sodium dichromate carbodiimide solution of the present invention is: in the situation that guarantee predetermined pressure the sodium dichromate carbodiimide solution is filtered, thereby guarantee that the sodium dichromate carbodiimide solution can not produce back reaction.The predetermined pressure of filtrate pressure-regulating valve control can reach good filter effect like this for being not less than 0.6MPa, and can satisfy again the rear carbodiimide solution of filtration is the requirement of certified products.Through the wash water washing process, the byproduct sodium acid carbonate chrome content that obtains reduces greatly.Dry up through water under high pressure extruding and compressed air, the natrii bicarbonas filter cake water content can be controlled in 10%, so that follow-up use.In addition, adopt the method discharge time of the present invention short, can satisfy the requirement of the sodium dichromate carbodiimide solution being carried out continuous filtration.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc. and all should be included within protection scope of the present invention.
Claims (10)
1. the filter method of a sodium dichromate carbodiimide solution is characterized in that, comprising:
Preparation sodium dichromate carbodiimide solution;
In the situation that keep predetermined pressure described sodium dichromate carbodiimide solution is filtered.
2. method according to claim 1 is characterized in that, comprises in the situation that keep predetermined pressure that described sodium dichromate carbodiimide solution is filtered:
In the situation that keep predetermined pressure, by feed pipe described sodium dichromate carbodiimide solution is delivered to vertical plate and frame filter press;
In described vertical plate and frame filter press, described sodium dichromate carbodiimide solution is filtered;
Sodium dichromate carbodiimide solution after will filtering by the filtrate output tube road is delivered to the filtrate storage tank.
3. method according to claim 2 is characterized in that, is provided with the filtrate pressure-regulating valve in described filtrate output tube road, keeps described predetermined pressure by described filtrate pressure-regulating valve.
4. each described method in 3 according to claim 1 is characterized in that, described predetermined pressure is not less than 0.6MPa.
5. method according to claim 2 is characterized in that, is provided with the charging control valve at described feed pipe.
6. method according to claim 2 is characterized in that, adopts compressed air to dry up and the wash water washing process in filter process.
7. method according to claim 6 is characterized in that, described compressed air dries up and the blow gas pressure of wash water washing process is that 0.6MPa, gassing time are 60s-120s.
8. method according to claim 2 is characterized in that, adopts the high-pressure hydraulic pump extrusion process in filter process.
9. method according to claim 8 is characterized in that, the high-pressure hydraulic pump pressure of described high-pressure hydraulic pump extrusion process is 2.0MPa.
10. method according to claim 1 is characterized in that, in the situation that keep also comprising after predetermined pressure filters described sodium dichromate carbodiimide solution: obtain sodium dichromate thereby the sodium dichromate carbodiimide solution after filtering processed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012103554541A CN102847372A (en) | 2012-09-24 | 2012-09-24 | Filtering method of sodium bichromate carbonizing liquid |
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| CN2012103554541A CN102847372A (en) | 2012-09-24 | 2012-09-24 | Filtering method of sodium bichromate carbonizing liquid |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101293151A (en) * | 2008-06-20 | 2008-10-29 | 唐山三友化工股份有限公司 | Filter-press method for abraum salt slurry in brine fine purification working procedure with ammonia soda process |
| CN101670202A (en) * | 2009-09-30 | 2010-03-17 | 核工业烟台同兴实业有限公司 | Vertical type full automatic pressure filter |
| CN102649585A (en) * | 2011-08-22 | 2012-08-29 | 四川省安县银河建化（集团）有限公司 | Preparation method of sodium bichromate |
-
2012
- 2012-09-24 CN CN2012103554541A patent/CN102847372A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101293151A (en) * | 2008-06-20 | 2008-10-29 | 唐山三友化工股份有限公司 | Filter-press method for abraum salt slurry in brine fine purification working procedure with ammonia soda process |
| CN101670202A (en) * | 2009-09-30 | 2010-03-17 | 核工业烟台同兴实业有限公司 | Vertical type full automatic pressure filter |
| CN102649585A (en) * | 2011-08-22 | 2012-08-29 | 四川省安县银河建化（集团）有限公司 | Preparation method of sodium bichromate |
Non-Patent Citations (3)
| Title |
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| 《化学世界》 19661231 金星化工厂 碳化法生产重铬酸钠扩大试验 , 第06期 * |
| 章棣: "《分离机械选型与使用手册》", 31 May 1998, 机械工业出版社 * |
| 金星化工厂: "碳化法生产重铬酸钠扩大试验", 《化学世界》 * |
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Address after: 622656 Sichuan County Water Town Ju Applicant after: Sichuan Yinhe Chemical Co., Ltd. Address before: 622656 Sichuan County Water Town Ju Applicant before: Sichuan An County Yinhe Jianhua (Group) Co., Ltd. |
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Application publication date: 20130102 |