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

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 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 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.