31results about How to "Changing the relative volatility" patented technology

The invention discloses a method and system for simultaneously producing methacrylic acid and methacrolein. The system comprises a raw material feed preheater, a raw material vaporizing tower, a first oxidation reactor, a second oxidation reactor, a rapid cooling / acid washing coupled tower, a methacrolein stripping tower, a methacrolein absorption tower, a methacrolein recovery tower, a methacrolein light component removal tower and a methacrolein heavy component removal tower. The method comprises the following steps: preheating and vaporizing a raw material tert-butyl alcohol or isobutylene; then mixing with air and water; feeding to a catalyst-filled fixed-bed reactor; performing oxidation reaction to generate methacrylic acid and methacrolein; and performing effective rapid cooling, absorption and rectification to finally obtain 99%wt methacrolein and 30%wt crude methacrylic acid. The method and system have the advantages that the reaction conversion rate is high, the unreacted raw material can be effectively recovered, impurities and solid particles are removed, and high-purity methacrylic acid and methacrolein are produced.

The invention discloses a rectification separation method for ethanol-tert-butanol contained in waste water, which belongs to the field of multi-component azeotrope separation, and aims to provide a method with low investment, low energy consumption, no discharge of three wastes and high yield Ethanol-tert-butanol-water rectification separation method, the main points of its technical scheme are as follows, the waste water containing ethanol, tert-butanol and water is subjected to pre-dehydration treatment, azeotropic treatment, stripping treatment, extractive distillation treatment, and then ethanol and The tert-butanol is separated to obtain the product ethanol and tert-butanol; the azeotropic treatment stage adds an entrainer to remove water from the remaining material. The invention eliminates the pollution to the environment from the difficult-to-treat waste water, and at the same time recycles and obtains high value-added products.

The invention provides an extraction agent for extracting, rectifying and separating methanol and dimethyl carbonate azeotrope, application of the extraction agent, and a treatment method. The extraction agent is a mixed extraction agent containing ionic liquid. A system for extracting, rectifying and separating methanol and dimethyl carbonate azeotrope comprises a reaction rectifying tower, an extraction rectifying tower and an extraction agent regeneration tower which are sequentially connected, wherein the extraction rectifying tower uses the extraction agent to perform extraction and rectification. The extraction agent has the advantages that the extraction agent can effectively change the relative volatility of methanol and dimethyl carbonate azeotrope, increase the separation effectof the methanol and dimethyl carbonate azeotrope, the purity of obtained dimethyl carbonate can reach 99.8wt% or above, and the circulating loss rate of the extraction agent can be lowered to 0.01% orbelow; the extraction agent can guarantee the conversion rate of ethylene carbonate and lower the concentration of circulating methanol, and accordingly thermal load is reduced, and separation energyconsumption is reduced.

The invention relates to a method for separating methylbenzene and n-butyl alcohol mixture through extractive distillation. The method comprises the steps that dimethyl sulfoxide is used as an extracting agent to be introduced from the upper portion of an extractive distillation tower to make sufficient contact with the methylbenzene and n-butyl alcohol mixture introduced from the middle of the extractive distillation tower, after extractive distillation, methylbenzene is extracted from the top of the extractive distillation tower, and the extracting agent and n-butyl alcohol mixture enters an extracting agent recycling tower from the bottom of the extractive distillation tower. Through effective separation, n-butyl alcohol is extracted from the top of the extracting agent recycling tower, and the extracting agent is extracted from the bottom of the extracting agent recycling tower to be recycled. The process has the advantages of being low in energy consumption, simple in process, high in separation purity and the like.

A method for producing glufosinate-ammonium with low energy consumption. A trapping agent is used to trap methane and phosphorus trichloride high-temperature cracking materials, and the obtained trapping liquid is rectified to separate most of the phosphorous trichloride, and then React with ethanol to obtain a diethyl methylphosphonite collector solution containing a small amount of triethyl phosphite, rectify and separate the heavy component triethyl phosphite, then react with acrolein to prepare acetal, and finally pass through cyanamide glufosinate-ammonium through chemical reaction and hydrolysis.

The invention discloses a method of separating a mixture of tert-amyl alcohol and benzene by extractive distillation. According to the method, phenyl-ethanolamine compounds are taken as extraction agents, and the extraction agents are introduced to the upper part of an extractive distillation tower to fully contact with the mixture of tert-amyl alcohol and benzene introduced from the middle of the tower in the tower, then benzene is extracted from the top of the extractive distillation tower, and the extraction agents and tert-amyl alcohol are extracted from the bottom of the extractive distillation tower to enter an extraction agent recovery tower. Effective separation of the extraction agents and the tert-amyl alcohol is carried out in the extraction agent recovery tower, and the tert-amyl alcohol is extracted from the top of the extraction agent recovery tower, and the extraction agents are extracted from the bottom of the extraction agent recovery tower to be recycled. The method has the advantages of low energy consumption, simple process, realization of cyclic recovery of the extraction agents, high purity of products after the separation and the like.

The invention relates to a method for producing high-purity optical isoamylol through decompression and rectification. The method comprises the following steps of: lowering the operating pressure of input materials to be separated through a vacuum system by using a decompression and rectification tower and a tower-top condenser; increasing the relative volatility of optical isoamylol and isoamylol; dividing the optical isoamylol and isoamylol passed through the decompression and rectification tower into a gas-phase substance at the tower top and a liquid-phase substance at the tower bottom under the heat and mass transferring function; and setting a thermosyphon reboiler at the bottom of the decompression and rectification tower so that the gas-phase substance and liquid-phase substance flow back and are in reverse multistage contact. The invention solves the technical problems of low separation efficiency, complex process, high processing cost, and the like in the traditional separation method.

The invention discloses a separation method of a triethylamine-containing system difficult to separate. According to the technical scheme, water, alkaline water or brine is adopted as an extractant, acontinuous or intermittent extraction process is adopted to separate triethylamine and a second component without introduction of new impurities, and the water can be recycled with no production of wastewater; then rectification is performed so as to remove residual triethylamine and second component in a raffinate phase, the relative volatility of the triethylamine and second component in the raffinate phase can be changed greatly, and high-content triethylamine and second component can be recovered efficiently from the raffinate phase containing low content of triethylamine and second component; and the operation in the distillation step can be completed by using a simple rectification unit, the evaporation amount is limited, and the energy consumption is controllable; therefore, extraction and rectification are coupled in the process so as to realize separation of triethylamine and the second component, and since water, alkaline water or brine is adopted as the extractant in the whole process with no introduction of other impurities, and addition of the alkali or salts is beneficial to separation of the triethylamine and the second component, the process has the advantages of simple equipment, investment cost saving, simple operation and operation cost saving, and the advantages are innovation points of the process.

The invention discloses a method and a device for performing refined separation on high-purity yellow phosphorous. A raw material storage tank is connected with a tower bottom; a rectifying tower is positioned above the tower bottom; one end of a condenser is connected with a tower top of the rectifying tower, while the other end is connected with a return tank; the return tank is connected with the tower top of the rectifying tower through a return flowmeter and connected with a front fraction tank and a product tank through a product flowmeter, and a discharge pipe of the product tank is connected with a product collecting tank; a vacuum pump is connected with the condenser, the return tank, the front fraction tank and the product tank through a buffer tank; and a nitrogen tank is connected with the raw material storage tank, the condenser, the return tank, the front fraction tank and the product tank. Through operation of performing rectification under reduced pressure and changinga reflux ratio, the method and the device reduce the boiling point of each component of the material greatly, change the relative volatility among the components, and have the advantages of uniform heating in the tower bottom, simple operation process, high separation efficiency and high purity of the product at the same time.