Energy-saving recovery technology of 3-dimethylaminopropylamine (DMAPA)

A dimethylaminopropylamine and process technology, applied in the field of surfactant production process, can solve the problems of large project investment, high recovery cost, and high energy consumption, and achieve low investment, no waste liquid treatment cost, and low energy consumption Effect

Inactive Publication Date: 2013-05-01
ZANYU TECH GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problems of multi-stage distillation unit: large project investment, high energy consumption, recovery cost is higher than the value of waste liquid

Method used

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  • Energy-saving recovery technology of 3-dimethylaminopropylamine (DMAPA)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Pump 720kg of DMAPA aqueous solution (amine value 431.2mgKOH / g) from condenser 1 to separator device 4, turn on the stirring, and add 204kg of solid sodium hydroxide and 5kg of calcium hydroxide from feed port 2 and check through the discharge port sight glass When the material is completely dissolved, stop stirring and let it stand for about 2 hours. Take the upper material from the discharge port to determine the amine value. The amine value is 1059mgKOH / g. Check the height of the upper material through the interface level gauge 3. DMAPA is conveyed to distillation kettle 6 through the discharge port for vacuum distillation; at the same time, the heating, condensation and vacuum system of distillation kettle 6 is turned on, so that the temperature of the material is controlled at 60~65℃, the relative pressure is controlled at -0.065~-0.08MPa, and DMAPA is collected The condensate is about 293kg (content 98.3%). The DMAPA condensate is directly transported to storage ta...

Embodiment 2

[0033] The 579kg DMAPA solution (amine value 215.6mgKOH / g) from the condenser 1 enters the separator 4 through the pipeline, and directly adds 158kg of anhydrous sodium chloride to the propylene diamine separation tank 4 through the feed port 2, and stirs for about 1 hour After standing for stratification, take the upper liquid to determine the amine value of 1063mgKOH / g; check the height of the upper material through the interface level gauge 3, send the upper DMAPA through the discharge port to the distillation kettle 6, turn on the vacuum and heating system, The temperature of the material is raised to 80~85℃, the relative pressure is controlled at -0.06~-0.07MPa, and about 118kg of DMAPA condensate is collected (DMAPA content is 98.6%); DMAPA is directly piped to storage tank B; the lower liquid is 618kg directly through the lower discharge port Pipeline to storage tank A.

Embodiment 3

[0035] The 540kg DMAPA aqueous solution (amine value 323.4mgKOH / g) from the condenser is pumped into the separation tank 4, 208kg potassium hydroxide is added from the feeding port 2, and stirred for about 1 hour, after uniformity, stand still for stratification, take the upper liquid to determine the amine value 1057.5mgKOH / g; Check the height of the upper material through the interface level gauge 3, and transport the upper DMAPA to the distillation kettle 6 through the right discharge port, and heat the material to 70~75℃, and control the relative pressure at -0.075~-0.08MPa , Collect a total of about 165kg of DMAPA condensate (DMAPA content 98.1%); transport DMAPA condensate to storage tank B; 582kg of lower layer liquid is directly piped to storage tank A through the lower discharge port.

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Abstract

The invention relates to an energy-saving recovery technology of DMAPA. The technology has the characteristics of energy consumption reduction, environmental protection benefiting, easy equipment making, and low production cost. A technical scheme adopted in the invention is characterized in that the energy-saving recovery technology of the DMAPA sequentially comprises the following steps: 1, allowing a DMAPA-water mixed solution from a condenser to enter a separator through a pipeline, adding a water removal agent through a feed inlet, stirring, and allowing the obtained mixture to stand for layering, wherein the addition amount of the water removal agent is 10-90% of the weight of the DMAPA-water mixed solution; 2, conveying the supernatant obtained in step 1 to a distillation kettle through a pipeline, carrying out reduced pressure distillation at a temperature of 60-140DEG C under a relative pressure of 0MPa - -0.085MPa, and collecting the obtained distillation condensate which is the DMAPA; and 3, discharging the lower-layer liquid obtained in step 1 from the material outlet at the bottom of the separator, wherein the lower-layer liquid is the aqueous solution of the water removal agent.

Description

Technical field [0001] The present invention relates to an energy-saving process for recovering DMAPA from 3-dimethylaminopropylamine (referred to as DMAPA) and water mixed solution. The water mixed solution is used in the production process of cationic surfactant alkylamidopropyl dimethyl tertiary amine A mixed solution of DMAPA and water produced in the It belongs to the field of surfactant production technology. Background technique [0002] DMAPA density 0.8100g / cm 2 , Freezing point -70°C, boiling point 134°C, molecular weight 102, soluble in water and organic solvents, corrosive, irritating to eyes, mucous membranes, and skin, and can cause burns to the human body. DMAPA is mainly used as an intermediate in organic synthesis to prepare dyes and ion exchange resins; as a curing agent for epoxy resin, oil and non-cyanide electro-galvanizing additives, fiber and leather treatment agents and fungicides. In the surfactant industry, DMAPA is one of the raw materials for the syn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C211/11C07C209/86
Inventor 雷小英夏雄燕徐浩华文高黄亚茹邹焕金
Owner ZANYU TECH GRP CO LTD
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