CN100427459C - Alkanolamine product distribution improvement method - Google Patents
Alkanolamine product distribution improvement method Download PDFInfo
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- CN100427459C CN100427459C CNB2005100947801A CN200510094780A CN100427459C CN 100427459 C CN100427459 C CN 100427459C CN B2005100947801 A CNB2005100947801 A CN B2005100947801A CN 200510094780 A CN200510094780 A CN 200510094780A CN 100427459 C CN100427459 C CN 100427459C
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- epoxy alkane
- ammonia
- ammoniacal liquor
- alkanolamine
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Abstract
The present invention relates to a method for improving the synthesis effect of alkanolamine, which belongs to the technical field of a chemical process. The method has the technical scheme that (1) after being fully mixed according to a certain proportion, raw material liquid ammonia and deionized water enter a reactor; alkyleneoxide comes out from a raw material tank area, firstly enters an intermediate tank, and then, is converted into each section of the reactor by a pump in order to supplement alkyleneoxide needed in the process of reaction; (2) before the alkyleneoxide and ammonia enter the reactor, the two sections of materials are converted into a high-efficiency mixer in order to achieve full contact. The present invention has the following advantages that the method can well improve the mixing uniformity of the two reaction materials, improve the preparation proportion of a main product, inhibit the occurrence of side reaction, reduce or eliminate impurity generation, reduce the product chroma and improve appearance indices.
Description
Technical field
The present invention relates to a kind of chemical industry synthetic method, the present invention relates to a kind of method of alkanolamine synthetic effect more precisely.Belong to the chemical technique technical field.
Background technology:
Alkanolamine product generally is meant and contains hydroxyl and amino product in the carbochain simultaneously.In the production process of this series products, whether qualified the control epoxy alkane contact degree of being uniformly dispersed with ammoniacal liquor be to influence product distribution, product key.Synthetic route before is directly epoxy alkane and two kinds of materials of ammoniacal liquor directly to be put together reaction, and the result makes the distribution of product not reach requirement, content does not meet technic index, may produce macromolecule impurity simultaneously.
Summary of the invention:
The purpose of this invention is to provide a kind of raw material that makes and to mix, improve the yield of alkanolamine product, accelerate alkanolamine synthetic speed, improve the method for the distribution of alkanolamine product in initial reaction stage.
The present invention takes following technical scheme to realize:
A kind of method of improving the distribution of thanomin product, its step is as follows:
(1) raw materials ammonia is entering mixing tank behind the thorough mixing by a certain percentage with deionized water, and epoxy alkane comes out to be introduced into tundish from the raw material tank field, again by pump delivery in each section reactor with epoxy alkane required in the postreaction process;
(2) before epoxy alkane and ammoniacal liquor enter reactor, in a Hi-mixer, make it reach contact fully two bursts of mass transport.The Hi-mixer that is adopted has two kinds: a kind of is the head-on collision mixing tank; Another kind is that Venturi and static mixer are used in combination.The head-on collision mixing tank mainly is a principle of utilizing convection current bump, and promptly material is entered by the two ends of mixing tank, and the two ends exit diameter of mixing tank is much smaller than the diameter of material conveying pipe, owing to the reason of pressure is sprayed going out the interruption-forming umbrella.Material moving back and forth between two ports finally reaches sufficient mixing.But in the use of head-on collision mixing tank,, be easy to result in blockage because exit diameter is very little.In addition, the head-on collision mixing tank is not easy to processing and safeguards.In view of this, the experimenter has proposed the scheme that Venturi and static mixer are used in combination.It is more excellent to experiment showed, that employing Venturi and static mixer are used in combination method, and equipment is convenient to processing, is convenient to industrialization.
(3) two strands of materials of epoxy alkane after fully mixed and ammoniacal liquor enter in the reactor immediately, and reactor can divide the 2-8 section, all are provided with the epoxy alkane pump at every section material inlet place and are used for replenishing epoxy alkane;
(4) contain ammonia, water and a spot of impurity in the mixture that from reactor, comes out.Utilize the boiling point of ammonia and water to hang down and mixture can be taken off ammonia by flash distillation, deamination two procedures earlier, going out the water of the inside through dehydration tower.Because the boiling point of thanomin corresponding product is also inequality, also can obtain an alkanolamine, dioxane hydramine, three alkanolamines respectively through the distillatory method.
The present invention has following advantage:
1, two kinds of reaction mass blended of the fine raising of energy degree of uniformity;
2, improve the generation ratio of major product;
3, suppress side reaction and carry out, reduce or eliminate impurity and produce;
4, reduce product colourity, improve appearance index.
Description of drawings
Fig. 1 is a kind of production scheme that improves the method for thanomin synthetic effect of the present invention.
Wherein 1 is the oxyethane tundish, and 2 is aqua ammonia pump, and 3 is the oxyethane pump, and 4 is venturi mixer, and 5 is static mixer, and 6 is reactor.
Embodiment
A kind of method of improving the thanomin synthetic effect of the present invention as shown in Figure 1 is that its step of example is as follows with the thanomin:
(1) raw materials ammonia is entering mixing tank behind the thorough mixing by a certain percentage with deionized water, and oxyethane comes out to be introduced into tundish from the raw material tank field, again by pump delivery in each section reactor with oxyethane required in the postreaction process.
(2) before oxyethane and ammoniacal liquor enter reactor, in a Hi-mixer, make it reach contact fully two bursts of mass transport.Used Hi-mixer adopts Venturi and static mixer to be used in combination.This combined method is more excellent, and equipment is convenient to processing, is convenient to industrialization.
(3) two strands of materials of oxyethane after fully mixed and ammoniacal liquor enter in the reactor immediately, and reactor always is divided into three sections, all are provided with the oxyethane pump at every section material inlet place and are used for the complementary ring oxidative ethane.
(4) contain ammonia, water and a spot of impurity in the mixture that from reactor, comes out.Utilize the boiling point of ammonia and water to hang down and mixture can be taken off ammonia by flash distillation, deamination two procedures earlier, at the water of removing the inside through dehydration tower.Because the boiling point of alkanolamine corresponding product is also inequality, also can obtain Monoethanolamine MEA BASF, diethanolamine and trolamine respectively through the distillatory method.
Sauerstoffatom in the oxyethane combines a hydrogen atom with ammonia and forms a hydroxyl under the katalysis of less water, generate Monoethanolamine MEA BASF, the oxygen in a hydrogen then being arranged again on the amino in the Monoethanolamine MEA BASF and adding the propylene oxide of coming in subsequently combines and forms hydroxyl generation diethanolamine.Propylene oxide generates trolamine with the diethanolamine reaction again.If ammoniacal liquor and oxyethane can not reach sufficient mixing before the reaction, in the product one, two, the distribution of trolamine will be very inhomogeneous.The yield of Monoethanolamine MEA BASF is not 20～30% before using Hi-mixer, also has the generation of a small amount of high boiling material in the product.Adopted that the yield of Monoethanolamine MEA BASF is 45～60% behind the collision type mixing tank.The mode that adopts Venturi and static mixer to be used in combination again, the yield of Monoethanolamine MEA BASF reaches 50～70%.Experiment showed, the distribution of adopting Hi-mixer (Venturi and static mixer are used in combination, or use the head-on collision mixing tank) can improve the thanomin product greatly.
The foregoing description does not limit the present invention in any form, and all technical schemes that form obtained of taking to be equal to replacement or equivalent transformation all drop within protection scope of the present invention.
Claims (1)
1, a kind of method of improving the distribution of thanomin product, its step is as follows:
(1) raw materials ammonia is entering mixing tank behind the thorough mixing by a certain percentage with deionized water, and epoxy alkane comes out to be introduced into tundish from the raw material tank field, again by pump delivery in each section reactor with epoxy alkane required in the postreaction process;
(2) before epoxy alkane and ammoniacal liquor enter reactor, in a Hi-mixer, make it reach contact fully two bursts of mass transport;
(3) two strands of materials of epoxy alkane after fully mixed and ammoniacal liquor enter in the reactor immediately, and reactor always is divided into six sections, all are provided with the epoxy alkane pump at every section material inlet place and are used for replenishing epoxy alkane;
(4) contain ammonia, water and a spot of impurity in the mixture that from reactor, comes out; Utilize the boiling point of ammonia and water to hang down and mixture can be taken off ammonia by flash distillation, deamination two procedures earlier, remove the water of the inside again through dehydration tower; Because the boiling point of alkanolamine corresponding product is also inequality, also can obtain an alkanolamine, dioxane hydramine, three alkanolamines respectively through the distillatory method;
It is characterized in that wherein said (2) is that the employing Hi-mixer is being used in combination of Venturi and static mixer; The jetting action by Venturi in the time of 5 to 50 ℃ of the first step high density ammoniacal liquor and epoxy alkane reaches short mix, material after the second step short mix carries out intensive disturbance, shearing at the static mixing sparger, collision reaches ammoniacal liquor and epoxy alkane is uniformly dispersed, and satisfies the condition of reaction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100947801A CN100427459C (en) | 2005-10-13 | 2005-10-13 | Alkanolamine product distribution improvement method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100947801A CN100427459C (en) | 2005-10-13 | 2005-10-13 | Alkanolamine product distribution improvement method |
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| Publication Number | Publication Date |
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| CN1762980A CN1762980A (en) | 2006-04-26 |
| CN100427459C true CN100427459C (en) | 2008-10-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2005100947801A Expired - Fee Related CN100427459C (en) | 2005-10-13 | 2005-10-13 | Alkanolamine product distribution improvement method |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101302083B (en) * | 2008-06-19 | 2013-09-25 | 南京红宝丽股份有限公司 | Method for continuous preparation of highly effective cement additive |
| EP2177501B3 (en) * | 2008-10-20 | 2016-11-02 | Sulzer Chemtech AG | Method and plant for the production of ethanol amines |
| CN101555208B (en) * | 2009-02-24 | 2013-07-31 | 湖北仙磷化工有限责任公司 | Ammonia-evaporating dewatering technique in production of neovaricaine |
| CN106608832B (en) * | 2015-10-22 | 2018-10-23 | 中国石油化工股份有限公司 | The process of liquid ammonia process for caustic soda purification and Ammonia Process co-producing ethanol amine |
| CN106748823B (en) * | 2016-12-19 | 2018-11-30 | 南京红宝丽醇胺化学有限公司 | A kind of preparation method of trialkanolamine |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1049653A (en) * | 1990-07-02 | 1991-03-06 | 浙江大学 | The process for liquid-liquid tube reaction that thanomin is produced |
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- 2005-10-13 CN CNB2005100947801A patent/CN100427459C/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1049653A (en) * | 1990-07-02 | 1991-03-06 | 浙江大学 | The process for liquid-liquid tube reaction that thanomin is produced |
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