36results about How to "Reduce acetic acid content" patented technology

The invention discloses a method for producing vinyl acetate. Inert gas is added into recycle gas to improve the explosion limit of oxygen, enlarge a stable area of a reaction system and improve the oxygen concentration of the reaction system, so that the reaction temperature is reduced, the service life of a catalyst is prolonged, and the selectivity of the vinyl acetate is improved. The inert gas is nitrogen or a mixture of nitrogen and methane. The concentration of the inert gas at the inlet of a reactor is 8 to 30 mol percent, and the molar concentration of the oxygen at the inlet of the reactor is 10.5 to 12 mol percent.

The invention discloses a vacuum low-temperature drying method for bovine bone glue, which comprises the following steps: 1) raw material preparation step: loading the concentrated bovine bone glue extract into a container, wherein the volume of the concentrated bovine bone glue extract is V1, and the container The volume is V2, V1: V2≤20%; 2) vacuum drying step: first the container of step 1) is put into microwave vacuum drying equipment and heated, so that the bovine bone glue extract concentrate is in a low-temperature boiling state; water vapor and The acetic acid vapor is sucked away by a vacuum pump, and the bovine bone glue extract is concentrated and dried to obtain the bovine bone glue. The vacuum low-temperature drying method of the invention has the characteristics of low acetic acid content, low energy consumption, short drying time, high product yield and high production efficiency.

The invention provides a method for preparing ethanol by hydrogenation of acetic acid with low energy consumption, which comprises the following steps: (1) gas phase hydrogenation; (2) gas-liquid separation; (3) esterification reaction; (4) product refining: the liquid phase Product B is sent to the first rectification column to produce the first overhead fraction and the first bottom fraction, and the first overhead fraction is partially returned to the gas phase hydrogenation reactor; the first column still fraction is sent to the neutralization reactor ; The neutralized first bottom fraction is sent to the second rectification tower, separated into the second overhead fraction and the second bottom fraction, and the second overhead fraction is partly returned to the gas phase hydrogenation reactor In the process, part of it is recovered as a mixed solvent product; the second bottom fraction is sent to the third rectification column, and is separated into the third column bottom fraction containing water, acetate and butanol and the third column containing ethanol and water The top fraction, the ethanol content in the top fraction is 85-95wt%, and the acidity value is 0-25mg / L. The method can reduce energy consumption and improve the quality of ethanol products.

An ethanol product with low acidity is provided. The content of ethanol in the ethanol product is 99.9-92 wt%. The acid value calculated based on acetic acid is 0-5 mg / L. The ultraviolet light transmittance is 50-99 at a wavelength of 220 nm.

The invention provides a method for preparing ethanol by hydrogenation of acetic acid with low energy consumption, comprising the following steps: (1) gas phase hydrogenation; (2) gas-liquid separation; (3) esterification reaction; (4) product refining: the liquid phase Product B is sent to the first rectification tower, and the first bottom fraction is sent to the second rectification tower, and the second tower overhead fraction is partially returned to the hydrogenation reactor described in (1), and partly As a mixed solvent product, the still fraction of the second tower is sent to the neutralization reactor, and an alkaline substance is added for neutralization reaction; the neutralized still fraction of the second tower is sent to the third rectification tower. The method can reduce energy consumption and improve the quality of ethanol products.

The invention relates to an integrated process for recovering acetic acid and methyl acetate in a production process of aromatic carboxylic acid. The integrated process is as follows: water solution of acetic acid from an oxidation unit enters the upper part of a dehydrating tower, steam at the top of the dehydrating tower enters a condenser at the tower top for cooling, and concentrated acetic acid extracted from a tower kettle directly returns to an oxidation reactor; condensed fluid at the top of the dehydrating tower enters a phase splitter and is automatically splitted into an oil phase and a water phase, the oil phase enters an entrainer refining tower, methyl acetate is extracted from the tower top and is recovered, and the entrainer in the tower kettle returns to the top of the dehydrating tower; the water phase enters a methyl acetate recovering tower, methyl acetate extracted from the tower top and methyl acetate at the top of the entrainer refining tower are recovered together, water part in the tower kettle flows back to the top of the dehydrating tower, and part of water is extracted and treated. When the entrainer in the acetic acid of the tower kettle of the dehydrating tower is higher than 5 percent, the tower kettle material firstly enters an entrainer separating tower, the condensed acetic acid extracted from the tower top returns to the oxidation reactor, and excess entrainer is separated from the tower kettle. By utilizing the process, the quantity of the entrainer flowing back can be greatly reduced, and the oxidation reaction can be stably performed.

The invention discloses a water-rich solvent graded utilization emission reduction system for preparing terephthalic acid, which includes multiple units such as oxidation reaction, rectification and dehydration, oxidation and refining filtration, solvent stripping, and multi-effect distillation. Through the optimized allocation of materials, the use of water-rich solvents with different grades of acetic acid concentrations in grades can greatly reduce the amount of fresh water and reduce the organic matter content in the discharge liquid under the premise of ensuring product quality and effective use of reaction heat. The technical key lies in: (1) The dehydration unit is equipped with a three-stage rectification tower, and the water-rich solvent produced by each unit in the oxidation and refining process is refluxed into the rectification tower at each level according to the concentration matching rules, and the water-rich solvent obtained by rectification is in accordance with the concentration requirements of different acetic acid They are respectively used for oxidation filter washing, refining filter washing, exhaust gas spraying, etc.; (2) Use the low-pressure steam produced by the system to perform multi-effect distillation on the discharge liquid, fully recover the acetic acid in the discharge liquid, and reduce the consumption of acetic acid in the system.

The invention provides a method for producing ethanol by hydrogenation of acetic acid with low energy consumption, which comprises the following steps: (1) gas phase hydrogenation; (2) gas-liquid separation; (3) esterification reaction; (4) product refining: the liquid phase Product B is sent to the neutralization reactor, and alkaline substances are added for neutralization reaction. The neutralized product enters the first rectification tower, and the first tower overhead fraction contains acetaldehyde, ethyl acetate, acetone, and the first tower bottom fraction It is a crude ethanol product containing ethanol and water. The first tower overhead fraction is partially returned to the gas phase hydrogenation reactor, and the first tower bottom fraction is sent to the second rectification tower. The second tower overhead fraction contains ethanol and water. The bottoms fraction contains water, ethanol, butanol and acetate. The method can reduce energy consumption and improve the quality of ethanol products.

The invention discloses a photovoltaic encapsulation material EVA adhesive film resisting potential induced attenuation. EVA with the VA content being 8 to 21wt percent and low-density polyethylene orvinyl copolymer with the melting rang being 70 to 130 DEG C are mixed into matrix resin; then the matrix resin, complex absorbing sodium ion and other assistants are subjected to premixing, melt extrusion, casting and film formation, cooling, slitting and rolling processes, so that the adhesive film is formed. The ion mobility is reduced through proper reducing of the VA content, the improvementof the volume resistivity of the EVA adhesive film and the reducing of the content of acetic acid in a photovoltaic system from the source. The volume resistivity of the EVA adhesive film is improvedthrough the adding of the high-melting polyethylene or vinyl copolymer, and meanwhile water vapor transmittance is reduced. Environment of sodium ion on the surface of a battery is reduced through theadding of the complex absorbing sodium ion, passivation phenomenon caused in a battery piece antireflection layer is weakened or even eliminated, and the potential induced attenuation resistance of the adhesive film is improved.

The invention discloses a preparation method of optical cellulose triacetate, belonging to the technical field of high polymer chemistry. The method comprises the following steps of: (1) crushing of the refined cotton; (2) drying of the refined cotton; (3) activation; (4) esterification; (5) neutralization; (6) dilution and bleaching; (7) filtering, precipitation, wet crushing and washing; (8) drying; and (9) granulation. The method disclosed by the invention can reduce the ash content and acetic acid content of the cellulose triacetate and improve the mechanical properties and optical characteristics of a cellulose triacetate membrane; and the prepared cellulose triacetate has uniform particles and low viscosity and can be quickly dissolved.

The invention provides a low-energy consumption method for preparing ethanol through acetic acid hydrogenation. The method comprises 1, gas phase hydrogenation, 2, gas-liquid separation, 3, esterification reaction and 4, product refining: feeding a liquid product B into a first rectifying tower, feeding a part of the first rectifying tower top fraction containing acetaldehyde, ethyl acetate and acetone back to a gas phase hydrogenation reactor, feeding the first rectifying tower bottom fraction as a crude ethanol product containing ethanol, ethyl acetate and water into a neutralization reactor, adding an alkaline substance into the neutralization reactor, carrying out a neutralization reaction process, feeding the neutralized first rectifying tower bottom fraction into a second rectifying tower, and carrying out separation to obtain a second rectifying tower top fraction containing ethanol and water and a second rectifying tower top fraction containing water, butanol and acetate, wherein the second rectifying tower top fraction has ethanol content of 85-95wt% and an acidity value of 0-25mg / L. The method can reduce energy consumption and improve ethanol product quality.

The invention discloses a sterilization and clarification method of an aged litchi alcoholic beverage, and relates to the field of sterilization, purification, clarification and aging of alcoholic beverages, and the method comprises the following steps: (1) litchi treatment, (2) litchi juice sterilization treatment: adding sucrose and malic acid into litchi juice, adjusting sugar degree and pH, and adding dimethyl dicarbonate, and treating at normal temperature to obtain sterilized litchi juice; (3) litchi juice fermentation: uniformly mixing the sterilized litchi juice, saccharomycetes, citric acid, amino acids, preservatives, vitamins and absolute ethyl alcohol, and performing sealed fermentation to obtain the litchi alcoholic beverage; (4) clarifying the litchi alcoholic beverage: adding bentonite into the litchi raw wine, uniformly stirring, standing, taking supernate, and filtering to obtain clarified wine liquid; and (5) wine liquid aging process: heating the clarified wine liquid to 70 DEG C, keeping the temperature for 10 minutes, quickly cooling to-7-0 DEG C, and keeping the temperature for 5-15 days to obtain the aged litchi alcoholic beverage.