CN105541725A - Preparation method of allantoin - Google Patents
Preparation method of allantoin Download PDFInfo
- Publication number
- CN105541725A CN105541725A CN201610145014.1A CN201610145014A CN105541725A CN 105541725 A CN105541725 A CN 105541725A CN 201610145014 A CN201610145014 A CN 201610145014A CN 105541725 A CN105541725 A CN 105541725A
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- CN
- China
- Prior art keywords
- wallantoin
- preparation
- allantoin
- filter cake
- filter
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Classifications
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D233/00—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, not condensed with other rings
- C07D233/54—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, not condensed with other rings having two double bonds between ring members or between ring members and non-ring members
- C07D233/66—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, not condensed with other rings having two double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
- C07D233/88—Nitrogen atoms, e.g. allantoin
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention discloses a preparation method of allantoin. According to the method, urea and glyoxylic acid have a condensation reaction to produce allantoin. The method comprises preparation steps as follows: feeding, reaction, filter-pressing, centrifugation, drying, crushing, inspection, packaging and storage. After the reaction step is finished, to-be-separated materials are pumped into a filter press for filter-pressing and subjected to solid-liquid separation, and filter cakes and waste liquor are formed; the filter cakes are centrifuged, allantoin is obtained and washed, and during washing, the allantoin is washed with hot water and then washed with tap water; the waste liquor is dried by an efficient centrifugal sprayer. Excessive urea in the reaction is effectively recovered, the production cost is reduced, clean production is realized, materials are sustainably utilized, and the content of the effective component, namely, allantoin, can reach 99% after centrifugal dehydration.
Description
Technical field
The invention belongs to wallantoin technical field, relate to a kind of wallantoin, is exactly a kind of preparation method of wallantoin.
Background technology
Wallantoin is produced and is produced wallantoin with urea and oxoethanoic acid generation condensation reaction, the urea that initial reaction stage is excessive and glyoxalic acid reaction for some time, during question response rate reduction, be heated to add the vitriol oil make to react completely as catalyzer, its reaction process is: feed intake-react-press filtration-centrifugal-dry-pulverize-detect-packaging-warehouse-in.There is following weak point in above-mentioned flow process:
The still material reacted enters after middle still leaves standstill cooling and carries out a press filtration, and the waste liquid that a press filtration is separated contains excessive urea, and cause raw material availability low, production cost is high;
In former technical process, use whizzer processing work in-process, materials from spattering in production process, and can not dewater completely, cause moisture content in finished product too high, the effective content of product is low;
Former technique is when wallantoin washs, and be directly use tap water, quality product is not high.
Summary of the invention
The object of the invention is to, for above-mentioned deficiency, provide a kind of preparation method of wallantoin.
Object of the present invention can be achieved through the following technical solutions:
A kind of preparation method of wallantoin, the method produces wallantoin with urea and oxoethanoic acid generation condensation reaction, its preparation process comprises: feed intake, react, press filtration, centrifugal, dry, pulverize, detect, packaging, warehouse-in, after described reactions steps completes, material to be separated is pumped into pressure filter press filtration, make material solid-liquid separation to be separated, form filter cake and waste liquid; Above-mentioned filter cake is carried out centrifuging process, obtains wallantoin, then wallantoin is washed, during washing, first use hot wash, and then with tap water; Above-mentioned waste liquid is dry via efficient centrifugal spraying machine.
During press filtration, material to be separated pumps into pressure filter in equipment, stops charging, passes into pressurized gas, press filtration under the pressure effect of pressurized gas.
Described filter cake is floating by scraper mechanism, eliminates filter cake crack, filter cake is evenly distributed, consistency of thickness, makes solid-liquid separation more thorough.
Described wallantoin washing 1h, during washing, with 40-60 DEG C of hot wash 20-40min, and then uses tap water.
Described efficient centrifugal spraying machine drying temperature is 150-300 DEG C.
Beneficial effect of the present invention:
(1), the present invention is by setting up a set of press filtration Waste liquid atomization recovery system, efficient recovery reacts excessive urea, improve level of clean production, liquid after being separated after press filtration is via after the drying of efficient centrifugal spraying machine, again can be reduced into solid, reuse, to production process, reduces production cost, achieve cleaner production, accomplish the sustainable use of material;
(2), the present invention introduces pressure filter in press filtration flow process, realizes material solid-liquid separation to be separated, makes solid-liquid separation more thorough, again carry out centrifuging process on this basis, better dewater, make wherein effective constituent Content of Allantoin reach 99%;
(3), the wallantoin that obtains of the present invention first uses hot wash, and then with washing from the beginning, improves quality product greatly, and saved the energy, saves a large amount of manpower and materials, reduces cost.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in further detail.
A preparation method for wallantoin, the method produces wallantoin with urea and oxoethanoic acid generation condensation reaction, and its preparation process comprises: feed intake, react, press filtration, centrifugal, dry, pulverize, detect, packaging, warehouse-in;
Above-mentioned after reactions steps completes, pumped into by material to be separated in pressure filter equipment, stop charging, pass into pressurized gas, press filtration under the pressure effect of pressurized gas, realizes the solid-liquid separation of material to be separated;
The filter cake that solid-liquid separation is formed is floating by special scraper mechanism, and eliminate filter cake crack, filter cake is evenly distributed, consistency of thickness, makes solid-liquid separation more thorough, again carries out centrifuging process on this basis, better dehydration, wherein effective constituent Content of Allantoin can reach 99%; Washing 1h is carried out to the wallantoin obtained after centrifugal, first uses 40-60 DEG C of hot wash 20-40min during washing, and then use tap water.
Wherein, the waste liquid that above-mentioned press filtration is separated contains excessive urea, and this waste liquid is dry via efficient centrifugal spraying machine, and drying temperature is 150-300 DEG C, again can be reduced into solid after drying, as raw materials for production reuse; This process is mainly completed by the atomizing disk of spraying machine, and under TRANSIENT HIGH TEMPERATURE, liquid becomes solid instantaneously, its essence adopts a kind of negative pressure drying mode, reduce production cost by the mode of mother liquor press filtration-drying-recovery, realize cleaner production, accomplish the sustainable use of material;
Reaction process of the present invention:
Existing process modification for first to use hot wash, and then with washing from the beginning, improves quality product greatly, and has saved the energy, and save a large amount of manpower and materials, reduce cost, particular case is as following table:
Above content is only citing made for the present invention and explanation; affiliated those skilled in the art make various amendment to described specific embodiment or supplement or adopt similar mode to substitute; only otherwise depart from invention or surmount this scope as defined in the claims, protection scope of the present invention all should be belonged to.
Claims (5)
1. a preparation method for wallantoin, the method produces wallantoin with urea and oxoethanoic acid generation condensation reaction, and its preparation process comprises: feed intake, react, press filtration, centrifugal, dry, pulverize, detect, packaging, warehouse-in, it is characterized in that:
After described reactions steps completes, material to be separated is pumped into pressure filter press filtration, make material solid-liquid separation to be separated, form filter cake and waste liquid;
Above-mentioned filter cake is carried out centrifuging process, obtains wallantoin, then wallantoin is washed, during washing, first use hot wash, and then with tap water;
Above-mentioned waste liquid is dry via efficient centrifugal spraying machine.
2. the preparation method of a kind of wallantoin according to claim 1, is characterized in that: during press filtration, and material to be separated pumps into pressure filter in equipment, stops charging, passes into pressurized gas, press filtration under the pressure effect of pressurized gas.
3. the preparation method of a kind of wallantoin according to claim 1, is characterized in that: described filter cake is floating by scraper mechanism, eliminates filter cake crack, filter cake is evenly distributed, consistency of thickness, makes solid-liquid separation more thorough.
4. the preparation method of a kind of wallantoin according to claim 1, is characterized in that: described wallantoin washing 1h, during washing, with 40-60 DEG C of hot wash 20-40min, and then uses tap water.
5. the preparation method of a kind of wallantoin according to claim 1, is characterized in that: described efficient centrifugal spraying machine drying temperature is 150-300 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610145014.1A CN105541725A (en) | 2016-03-14 | 2016-03-14 | Preparation method of allantoin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610145014.1A CN105541725A (en) | 2016-03-14 | 2016-03-14 | Preparation method of allantoin |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105541725A true CN105541725A (en) | 2016-05-04 |
Family
ID=55821340
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610145014.1A Pending CN105541725A (en) | 2016-03-14 | 2016-03-14 | Preparation method of allantoin |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105541725A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102898376A (en) * | 2012-10-08 | 2013-01-30 | 北京桑普生物化学技术有限公司 | Allantoin synthesis method |
| CN103145621A (en) * | 2013-03-01 | 2013-06-12 | 凤台县精华助剂有限公司 | Allantoin preparation method |
-
2016
- 2016-03-14 CN CN201610145014.1A patent/CN105541725A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102898376A (en) * | 2012-10-08 | 2013-01-30 | 北京桑普生物化学技术有限公司 | Allantoin synthesis method |
| CN103145621A (en) * | 2013-03-01 | 2013-06-12 | 凤台县精华助剂有限公司 | Allantoin preparation method |
Non-Patent Citations (2)
| Title |
|---|
| 刘亚强等: "尿囊素的化学合成", 《宝鸡文理学院学报(自然科学版)》 * |
| 胡卫东: "尿素深加工技术两则", 《氮肥设计》 * |
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Application publication date: 20160504 |
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| RJ01 | Rejection of invention patent application after publication |