36results about How to "Improve hydrolysis yield" patented technology

The invention creatively provides a method for strengthening nitrogen and phosphorus removal by using the hydrolysis and fermentation of mixed sludge of a sewage plant. According to the method, part of activated sludge returns to a primary sedimentation tank and is mixed with primary sedimentation sludge, so as to be subjected to precipitation and concentration, the precipitated and concentrated mixed sludge enters a hydrolysis tank which can consist of a separate reactor and can also consist of two series reactors, and is subjected to hydrolysis and fermentation in the hydrolysis tank, so as to produce easily-degradable organic matters (rbCOD) or volatile fatty acids (VFAs), and after the process is completed, a hydrolyzed mixed solution which is rich in VFA, or supernatant is introduced into an anaerobic tank or anoxic tank of a biological pool, thereby realizing the aim of strengthening nitrogen and phosphorus removal. The method provided by the invention has the advantages that the carbon source insufficiency of inlet water can be effectively improved, the biological nitrogen and phosphorus removal function can be strengthened, and the addition of an external commercial carbon source is reduced or canceled; the method is applicable to the new construction of sewage plants and is also applicable to the upgrading and reconstruction of the existing sewage plants.

The invention discloses a pretreatment method for lignocellulose raw materials, which belongs to the technical field of biomass separation and conversion. In the method, p-toluenesulfonic acid is used as the hydrogen bond donor, choline chloride is used as the hydrogen bond acceptor, and ethanol is added to synthesize a novel deep eutectic solvent, and the lignocellulose raw material is pretreated under mild conditions. The method can degrade more than 70% of lignin and 40% to 90% of hemicellulose in lignocellulosic raw materials, increase the cellulase hydrolysis yield to 100%, and at the same time separate the lignin components under low temperature conditions It can be further used for high value. This new DES system can be recycled and reused. It is a green and efficient pretreatment method with high application and promotion value.

The invention provides a method for preparing fermentable sugar and lignosulfonate from furfural residues. The method comprises the following steps of 1, ethanol and sulfite-based pretreatment comprising that furfural residues reacts with sulfite in an ethanol solution and reaction products are subjected to solid-liquid separation, 2, countercurrent washing comprising that the solids obtained by the step 1 are subjected to multistage countercurrent washing by an ethanol washing liquid, 3, enzyme hydrolysis comprising that the solids subjected to the multistage countercurrent washing are subjected to cellulase hydrolysis, and 4, ethanol recovery comprising that the liquid obtained by the solid-liquid separation in the step 1 is mixed with the washing liquid recovered after the countercurrent washing in the step 2 and the mixed solution is subjected to pressure reduction condensation to form ethanol and lignosulfonate. The method utilizes combination of an organic solvent method and a sulfite method. Through the sulfite method, furfural residues are pretreated so that furfural residue sample hydrophily is improved and lignin removal and hydrolysis rate increasing are realized. Through the organic solvent method, the raw materials are pre-treated so that pretreatment liquid recovery and recycle are realized and a production cost is reduced.

The invention relates to foaming agent of waterproof foam concrete, a preparation method and a construction method, which belongs to the fields of construction materials, a preparation method thereof and an architectural method thereof. The foaming agent of the invention comprises the following raw materials in part by weight: 30 to 35 parts of keratinous albumen powder, 4 to 5 parts of Ca(OH)2, 1.5 to 2.5 parts of NaHSO3, 270 to 320 parts of water, 0.8 to 1.5 parts of sodium dodecyl benzene sulfonate (SDBS), 0.2 to 0.7 part of sodium dodecyl sulfate, 0.8 to 1 part of gelatin and 0.5 to 1 part of trolamine. The weight of sulphamic acid is matched with that of Ca(OH)2 and NaHSO3, and the pH value of the mixed three materials reaches 7.

The invention relates to the technical fields of leather making chemistry and engineering, and provides a method for preparing a modified collagen polypeptide leather-making filler from chrome-free multi-metal tanned leather shavings. The method of leather filler can reduce the environmental pollution caused by tanning, solve the problem of difficulty in handling leather scraps in enterprises, and at the same time can save resources, save the cost of tanning, and improve the economic benefits of enterprises; the modified collagen polypeptide prepared by the method The tanning filler has moderate molecular weight, high hydrolysis yield, positive electricity and antibacterial and mildew resistance. It can avoid the discoloration of leather when applied in the tanning process, and can promote the absorption of other anionic materials in the tanning process. Moldy.

The invention provides a method for immobilizing cellulase and hydrolyzing cellulose. The method for preparing immobilized cellulase uses sodium alginate as a carrier, and utilizes OH in sodium alginate ‑ and COOH ‑ Oxygen atom and Ca 2+ The principle of ion exchange reaction forms a gel, polyethylene glycol is used as a porogen and a hydrophilic agent, glutaraldehyde is used as a crosslinking agent, and the gel is formed between chitosan and sodium alginate-polyethylene glycol immobilized enzyme The polyelectrolyte membrane improves the stability of the immobilized enzyme. Using immobilized cellulase to hydrolyze cellulose can realize the repeated utilization of cellulase. Adding polyethylene glycol and chitosan can improve the enzyme fixation rate and enzyme activity of immobilized cellulase, reduce the Michaelis constant, increase the pore density of the carrier surface, increase the reducing sugar content of the enzymatic hydrolysis reaction, the enzymatic hydrolysis yield and TS degradation rate. The preparation and application method of the invention is simple and convenient to operate, mild in fixing conditions, low in investment and friendly to the environment.

The invention provides a production method for continuous bubble tower absorption of polysorbate. The production method is characterized in that butenal and a polymerization catalyst are sprayed and are continuously fed from the top of a secondary spray absorption tower (5), and the butenal and the polymerization catalyst, together with unreacted ketene tail gas released from the top of a bubble packed tower (2), are absorbed to the secondary spray absorption tower (5) through negative pressure formed by a Venturi jet pump (7) for a circulating absorption reaction, are fed to the bottom of the bubble packed tower (2) through a first circulating pump (3), and participate in a ketene and butenal polymerization reaction focusing on downstream negative pressure absorption together with ketene from the bottom of the bubble packed tower (2) under normal pressure; a qualified polyester solution is continuously extracted from the top of the bubble tower. The method can realize continuous reaction between high-concentration butenal and high-concentration ketene within relatively short time, so as to avoid generation of more tar, guarantee safe and stable production, improve the polymerization efficiency and the polyester quality, and reduce the production cost; the method has good reaction prospect.

The invention belongs to the fields of lignocellulose utilization and energy and chemical application, and discloses a green method for increasing a cellulose enzymolysis efficiency in rice straws by utilizing lactic acid / guanidine hydrochloride to extract hemicellulose. The green method includes: taking the lactic acid / the guanidine hydrochloride as a solvent to preprocessing the rice straws, filtering and separating to obtain residues, and drying to obtain preprocessed rice straws; taking the rice straw residues as a base material, and subjecting the base material to enzymolysis by cellulose so as to obtain a liquid sugar which mainly comprises glucose. The green method has the advantages that the enzymolysis efficiency of the rice straws can be increased effectively, a yield rate of fermentable reducing sugar is increased, and the defects of high cost and environmental unfriendliness of an ionic liquid preprocessing process are overcome.