90 results about "Acetic acid concentration" patented technology

A stable continuous method for producing ethanol from the anaerobic bacterial fermentation of a gaseous substrate containing at least one reducing gas involves culturing a fermentation bioreactor anaerobic, acetogenic bacteria in a liquid nutrient medium; supplying the gaseous substrate to the bioreactor; and manipulating the bacteria in the bioreactor by reducing the redox potential, or increasing the NAD(P)H TO NAD(P) ratio, in the fermentation broth after the bacteria achieves a steady state and stable cell concentration in the bioreactor. The free acetic acid concentration in the bioreactor is maintained at less than 5 g/L free acid. This method allows ethanol to be produced in the fermentation broth in the bioreactor at a productivity greater than 10 g/L per day. Both ethanol and acetate are produced in a ratio of ethanol to acetate ranging from 1:1 to 20:1.

Acetic acid is produced while inhibiting increased concentrations of hydrogen iodide and acetic acid in an acetaldehyde distillation column.

A production process of acetic acid comprises a step for allowing methanol to react with carbon monoxide; a step for feeding a flasher with the reaction mixture to separate a volatile component (2A) and a low-volatile component (2B); a step for feeding a distillation column with the volatile component (2A), and separating an overhead (3A) containing methyl iodide, acetic acid, methyl acetate, water, acetaldehyde, and hydrogen iodide, and a stream (3B) containing acetic acid to collect acetic acid; and a separation step for feeding an acetaldehyde distillation column with at least part of the overhead (3A) and separating a liquid object to be treated containing the overhead (3A) into a lower boiling point component (4A) containing acetaldehyde and a higher boiling point component (4B); wherein, in the separation step, the liquid object contains methanol and/or dimethyl ether in a concentration of 0.1 to 50% by weight is subjected to distillation.

The present invention provides a method for manufacturing a water-absorbing resin which (i) is made of acrylic acid that is suitable for mass production of water-absorbing resin and (ii) has an excellent water-absorbing property. In the method, a polyacrylic acid (salt)-based water-absorbing resin is manufactured by sequentially carrying out predetermined monomer preparing step, polymerization step, drying step, and surface crosslinking step. An acetic acid concentration in acrylic acid or the like supplied in the monomer preparing step is in a range of 300 ppm to 10000 ppm on the acrylic acid basis, and an acetic acid concentration lowering rate defined by a predetermined formula is 35% or higher.

The present invention provides a etching solution blending device which is used in a semiconductor manufacturing works or flat-panel display manufacturing works and is capable of constantly blending nitric acid concentration, moisture concentration, phosphoric acid concentration and acetic acid concentration of the etching solution. The device comprises: an electric conductivity meter for detecting the electric conductivity of the dilution formed by adding pure water into etching solution in a blending tank or an absorption spectrophotometer for detecting the nitric acid concentration of the etching solution, an absorption spectrophotometer for detecting the moisture concentration of the etching solution, an absorption spectrophotometer or a densitometer for detecting the phosphoric acid concentration of the nitric acid, a component concentration operation mechanism for operating the component concentration of the etching solution by multi-component operation method according to the electric conductivity value of the nitric acid concentration conductivity meter, the absorbency value of the moisture concentration absorption spectrophotometer, and the absorbency value of the phosphoric acid concentration absorption spectrophotometer or the density value of the densitometer, and a replenishing mechanism for replenishing at least one of acid original solution, mixed acid original solution and pure water into the blending tank.

The invention relates to a method for processing a solvent and byproducts in aromatic carboxylic acid production. The processed raw materials comprise a solvent, namely acetic acid and byproducts, namely methylacetate and water in the aromatic carboxylic acid production; and an extraction column, an azeotropic distillation column, a solvent recovery column, a catalytic distillation column and a four-element component separating column are involved in the whole process flow. In the method, the methylacetate of little value can be hydrolyzed into the acetic acid and methanol, so the single consumption of the acetic acid can be reduced in a PTA production process and the economic value of the device is improved; the water used in the methylacetate hydrolysis is taken from the waste water generated from acetic acid concentration, so water resource is effectively utilized, treatment capacity of the waste water is reduced, and the production cost is lowered; and besides, the using amount ofthe entrainer is reduced and the consumption is correspondingly reduced, so the method has the characteristics of high efficiency, energy conservation and the like.

The invention relates to a preparation method and application of a deacetylated chitosan ecological finishing agent used for finishing natural fibers and regenerated natural fiber fabrics. The invention aims to solve the technical problems of a crosslinking problem, size and uniformity of chitosan acetic acid sol particles and stability of the finishing agent. The method is technically characterized by comprising the following steps: mixing chitosan and lacial acetic acid to form an acetic acid aqueous solution with the acetic acid concentration of 1.5-3 percent, dripping a 10g/L of ion stabilizer agar solution, regulating the size of the chitosan colloid particles to be in a distribution range of 60-100nm, forming a uniform and stable acetic acid-chitosan colloid solution of which the colloid size is in a nanoscale, controlling the pH value to be 4-7, wherein the viscosity of the colloid solution is 2-60mPa.s. The method has good chitosan fixation effect, does not have harmful or chemical residues and is environment-friendly, high-efficiency, harmless to human bodies and rich in raw material source.

The invention provides an L-tryptophane fermentation process. The fermentation process comprises the following steps: adding 2g cottonseed cake powder to every 1 liter of an L-tryptophane fermentation medium to carry out fermentation; carrying out circulating filtration in the fermentation course when the yield of acetic acid is more than 5g/L and allowing clear fermentation liquid obtained after separation to enter into an extraction procedure; allowing concentrated bacteria liquid obtained after extraction to enter a fermentation tank, then replenishing a dialysis medium and then carrying out fermentation further, thus obtaining L-tryptophane. By adopting the fermentation process, the L-tryptophane production cycle is lengthened by 20 hours, the acetic acid concentration is maintained below 5g/L, the single tank yield is increased by 89% or above, and the conversion rate is increased from 17.0% to more than 18.5%; as the cottonseed cake powder is added to the fermentation medium and the cottonseed cake powder which is not utilized by thalli plays a role of a filter aid during filtration, the fermentation liquid filtering rate is increased from 85mL/min to 183mL/min.

The invention provides zymomonas mobilis resistant to high-concentration acetic acid and high-concentration furfural and application thereof. The accession number of the zymomonas mobilis is CMGCC No.10946. The zymomonas mobilis can quick grow in a culture solution containing 7.0 g/L of acetic acid and 3.0 g/L of furfural, and alcoholic fermentation can be performed quickly. Therefore, the zymomonas mobilis can directly perform fermentation on cellulose enzymatic hydrolysates on the conditions of high-concentration acetic acid and high-concentration furfural, and fuel alcohol is obtained through preparation.

The invention discloses lactobacillus acetotolerans. The lactobacillus acetotolerans is preserved in the China General Microbiological Culture Collection Center, the preservation date is 13 December 2018, and the preservation number is CGMCC NO.16938. The invention further discloses an application of the strain. The lactobacillus acetotolerans disclosed by the invention is high in tolerance to acetic acid, can convert carbohydrate substances into the lactic acid in high acetic acid environment of which the acetic acid concentration is 7.0g/100mL, and can produce fragrance substances of ethyl lactate and the like. After the strain is used in brewed liquid vinegar of which the total acid is 6.0-7.0g/100mL, the acid content can be increased to 0.76-0.91/L, the ethyl lactate content can be increased by 10 times or above and reach 13.69-15.26mg/L, the irritant of products is reduced, the softness is increased, the content of fragrance substances is increased, the flavor quality of the products is greatly improved, the application is convenient, and economic benefits of enterprises are significantly increased.

The invention provides a pH controlling technology for converting municipal sludge into acetic acid, belonging to the field of the recovery of waste. The technology performs different pH control modes to two phases in a coupling system of generating hydrogen and generating acid/consuming hydrogen and generating acetic acid. Before 12 days of fermenting generating hydrogen and generating acid phase (A phase), the pH is not controlled, and from 13 days, the pH is remained at 9-10; the pH is remained at 6.5 when fermenting consuming hydrogen and generating acetic acid (H phase); and the fermentation is stopped after 18 days. The concentration of A phase acetic acid is 7.53g/L, the concentration of H phase acetic acid is 1.45g/L, and the index of A phase SCOD is reduced by 56.7%. The technology solves the problem of the environment pollution caused by the municipal sludge, obtains the acetic acid with high additional value, discharges the polluted water which is easily processed (SCOD index is low), and has the advantages of convenient operation, low cost and obvious effect, etc.

Zymomonas mobilis mutant strains tolerant to high-concentration acetic acid and applications thereof are disclosed. The taxonomic name of one of the strains is zymomonas mobilis AQ8-1, and the accession number of the zymomonas mobilis AQ8-1 is GDMCC60258. The taxonomic name of the other strain is zymomonas mobilis AQ8-9, and the accession number of the zymomonas mobilis AQ8-9 is GDMCC60259. Mutation screening includes 1) performing room-temperature plasma induced mutation; 2) performing renewing culture by utilizing a medium; and 3) repeatedly screening under a high acetic acid concentration to obtain the strains. The strains can rapidly grow in a culture liquid containing 5.0-8.0 g/L of acetic acid, and can perform alcoholic fermentation. The invention also provides an alcoholic fermentation method.

The invention relates to a preparation method of a chitosan monomolecular layer film and belongs to the field of biological film preparation. The preparation method of the biological film comprises the following steps of: dissolving chitosan having deacetylation degree of 92% and molecular weight of 114200 daltons into 2% diluted acetic acid so as to prepare a 0.03g/L chitosan solution; carrying out acid catalysis reaction for 24 days at room temperature, then sucking 20 mu L of chitosan solution and dropwise adding the 20 mu L of chitosan solution on a mica plate the area of which is 1cm <2> so that a film is formed after the chitosan solution is freely volatilized; and scanning with an atomic force microscope to obtain feedback information to regulate soaking time, acetic acid concentration and sucked solution dosage to control film quality and coverage area so as to finally prepare the compact and uniform monomolecular layer chitosan film. By using the biological film preparation method, the super-thin monomolecular layer chitosan film can be prepared, and the uniformity of the biological film is ensured. The technical scheme of the invention is suitable for preparation of the biological film.

Production of cupric acetate is carried out by filling tower body with copper fillings, pouring cupric acetate mother liquid into tower base, circulation spraying for mother liquid by circulation pump, entering oxygen into junction of tower body and tower kettle, injecting running mother liquid into crystallizer, crystallizing, delivering the product into crystallizing filter, crystallizing, mother liquid separating, putting the separated acetate crystallization into drier, drying, putting the separated mother liquid into store tank, storing, adding into glacial acetic acid by additive metering vessel, adjusting radical acetic acid concentration in mother liquid, verifying and packing. It is high efficient and non-toxic. It can be used for insecticide, ceramic blended oil, catalyst and bactericide in green pesticide.

The invention relates to a cleaning agent for filter cloth for copper concentrate filtering. Residue matters and plugging particles of the surface of the filter cloth are analyzed, so that two kinds of inorganic acids, namely acetic acid and hydrofluoric acid which have a mutually-promoting role on a cleaning effect are determined at first. Then, in order that reaction of acids and silk threads or particle matters in fibers of the filter cloth is more complete, a nonionic penetrating agent JFC-E (a kind of fatty alcohol-polyoxyethylene ether) is added in acids, and therefore the aqueous cleaning agent with a significant cleaning effect is prepared. The acetic acid concentration of the cleaning agent is 9-15 percent, the hydrofluoric acid concentration is 0.5-1.5 percent, and the JFC-E concentration is 0.1-0.3 percent. As the two kinds of inorganic acids with the mutually-promoting role are adopted to react with the residue matters of the surface of the filter cloth, particles on the surface of the filter cloth can be effectively removed. Meanwhile, as the nonionic penetrating agent JFC-E is added, the cleaning agent can penetrate among the silk threads or fibers of the filter cloth to react with the plugging particles, the cleaning effect is greatly increased, and the production cost is reduced.

The object of the present invention is to provide a method for suppressing foam formation by identifying a gene involved in foam formation during culture of an acetic acid bacterium and reducing or deleting the function of a protein encoded by the gene, a method for more efficiently producing vinegar that contains a high concentration of acetic acid by using an acetic acid bacterium in which foam formation has been suppressed by the above method, and vinegar produced by the above production method. An acetic acid bacterium with suppressed foam formation was obtained by isolating a gene encoding a protein involved in foam formation during culture of an acetic acid bacterium, then by altering the gene by a modification to reduce or delete the function of a protein involved in foam formation. Further provided is a method for efficiently producing vinegar with higher concentration of acetic acid with the use of the acetic acid bacterium.

The invention belongs to the field of animal product detection and particularly relates to a milk protein detection method. A contract value (precipitation quality to milk volume) method is established to detect milk protein content, and the detection method for finding the milk protein content includes factors of milk standby time, centrifugation time, centrifugal rotational speed, ice acetic acid concentration and the like, and optimum parameters for precipitation of the milk protein are acquired, in other words, the standby time for the milk protein is 9 minutes, the centrifugation time is 7 minutes, the centrifugal rotational speed is 12000r/min, and the ice acetic acid concentration is 0.3mol/L; related data of the milk protein content and the contract value are subjected to partial lease squares analysis to acquire a regression linear equation of the milk protein content X to the contract value Y, namely the Y=0.0645X+0.0581, R2=9896, and higher linear correlation exists between the milk protein content X and the contract value Y within the scope ranging from 2.0g/100mL to 4.0g/100mL range.

A process is disclosed for monitoring separation streams of an ethanol purification process, including measuring the concentrations of impurities, monitoring one or more binary streams, or monitoring conductivity in an ethanol containing stream to determine acetic acid concentrations. The ethanol is produced by hydrogenating acetic acid. One or more on-line analyzers may be used to monitor the separation streams.

The invention provides a prediction system for predicting occurrence of calcium oxalate kidney stone, and belongs to the field of neural networks. The prediction system comprises an input module, a calculation module and an output module. I, the input module is used for transmitting the following information of a patient to the calculation module: gender, oxalic acid concentration in urine, aceticacid concentration in excrement, relative abundance value of g_Geobacter, relative abundance value of g_Kroppenstedtia, relative abundance value of g_Spharochaeta and relative abundance value of g_Oscillospira; II, a trained prediction network model for predicting the occurrence of calcium oxalate kidney stone is built in the calculation module; and III, the output module is used for outputting the probability value Y. Three clinical indexes and relative abundance values of four bacteria genus are combined, and a conventional algorithm is used, so that the occurrence of the kidney stone can be accurately predicted. The prediction effect of a random forest algorithm is the most accurate. The prediction method provided by the invention can accurately predict the kidney stone, especially calcium oxalate kidney stone, and can provide a basis for clinical diagnosis and treatment of kidney stone.

The invention belongs to the field of glucosamine production, and relates to a production method of glucosamine. The production method comprises the steps of: in the glucosamine fermentation process,monitoring at least one of an oxygen consumption rate, an oxidation-reduction potential, acetic acid concentration and a specific carbon dioxide release rate in fermentation liquor on line, and controlling the numerical value within a specific range by stages. According to the method provided by the invention, at least one of the oxygen consumption rate, the oxidation-reduction potential, the acetic acid concentration and the specific carbon dioxide release rate in the fermentation liquor is monitored and controlled on line to feed back process parameters of the regulation and control process,so that the thallus growth requirement can be met, glucosamine metabolic synthesis is effectively promoted, and the conversion rate is increased; and the content and conversion rate of the glucosamine in the obtained fermentation product are both high.