59results about "Anhydrosugars" patented technology

The disclosed preparation method for acetylized glucal comprises: preparing the D-acetylized glucose catalyzed by acids (HClO4, H2SO4, ZnCl2, AlCl3, p-toluenesulfonic acid and methanesulfonic acid); without separation or purification, leading directly the product into HBr or equivalent (such as PBr3 and water) to obtain and then recrystallize the coarse 1-bromoacetyl glucose with one of ethyl ether, propyl ether and isopropyl ether; adding Zn, ZnCl2, methanol and Co-ion catalyst to prepare the coarse target; recrystallizing with alcohol for the refined product. This invention saves step and reduces cost.

This invention concerns a process for recovering and purifying dianhydro sugar alcohols from a vapor stream comprising dianhydro sugar alcohols, such as isosorbide, and water vapor.

The invention belongs to the field of biomass energy utilization and particularly relates to a method for preparing levoglucose ketone through catalyzing and pyrolyzing cellulose by utilizing solid phosphoric acid. The method comprises the steps of taking the solid phosphoric acid as catalyst, mechanically mixing with the cellulose, carrying out fast pyrolysis at a temperature of 280-450 DEG C under an oxygen-free condition, condensing the pyrolysis gas and obtaining a liquid product rich in the levoglucose ketone. In the liquid product obtained through catalyzing and pyrolyzing the cellulose by utilizing the solid phosphoric acid, the yield and the purity of the levoglucose ketone are both high; in addition, the solid phosphoric acid catalyst is stable in performance and can be repeatedly and cyclically utilized.

The invention belongs to the field of utilization of biomass energy, and in particular relates to a method for preparing levoglucosenone through biomass catalytic pyrolysis. The method comprises the following steps: by taking biomass base phosphoric acid activated carbon as a catalyst, performing mechanical mixing on the catalyst with biomasses, performing flash pyrolysis at 250-470 DEG C under an inert anaerobic condition, and condensing a pyrolysis gas, thereby obtaining a liquid product rich in levoglucosenone. In pyrolysis products of the biomasses subjected to catalytic pyrolysis of the biomass base phosphoric acid activated carbon, the yield and the purity of levoglucosenone are both relatively high; in addition, a mixture of solid coke generated through pyrolysis and the catalyst can be used as a carbon source which is continuously adopted to prepare activated carbon; due to adoption of the biomass base phosphoric acid activated carbon which is low in price and can be recycled, the production cost and the pollution can be effectively reduced, and the method is an economic and effective method for preparing the levoglucosenone.

The present invention relates to a method for preparing 3,6-anhydro-L-galactose, and use thereof. More specifically, 3,6-anhydro-L-galactose, which is a monosaccharide constituting agar, is produced in a high yield through chemical and enzymatic methods, and the physiological activities thereof such as whitening, moisturizing, antioxidant, anti-inflammatory activities and the like are displayed, thereby enabling industrial use thereof.

The invention discloses a method for preparing laevoglucose ketone and special reaction equipment thereof. The reaction equipment comprises a fluidized bed pyrolysis reactor(4), wherein an opening on the bottom part of the side wall of the fluidized bed pyrolysis reactor(4) is connected with a feeder(2) by a tube, an opening at the top end of the reactor(4) is connected with a separator(6) by a tube, an opening at the top end of the separator(6) is connected with an opening at the top end of a catalytic reactor(7) by a tube, an opening on the bottom part of the catalytic reactor(7) is connected with a condenser(8) by a tube, and the bottom part of the condenser is provided with a liquid outlet. The preparation method comprises the following steps of: in the reaction equipment, feeding cellulose or biomass materials to the pyrolysis reactor for pyrolysis, performing gas-solid separation by the separator, performing a catalytic cracking reaction of the pyrolyzed gas generated in the pyrolysis reaction in a reactor filled with a catalyst of chromic chloride, and after reaction, condensing the gas by the condenser to obtain the finished product. Because the celluloses or biomass are used as raw materials and the yields of the organic liquid products all reach over 15 percent, wherein the laevoglucose ketone content reaches over 30 percent.

The invention belongs to the field of biomass energy use and particularly relates to a levoglucosenone preparation method. The levoglucosenone preparation method includes: mechanically mixing char sulfonic acid or magnetic char sulfonic acid serving as a catalyst with biomass raw materials, performing fast pyrolysis at the temperature of 280-450 DEG C under the anaerobic condition, and condensing pyrolysis gas so that a liquid product rich in levoglucosenone can be obtained. In the liquid product prepared by the method, both yield and purity of the levoglucosenone are high; and the catalyst is stable in performance, can be directly separated and recovered from solid residues mechanically or by the aid of a magnetic field and is reusable.

The invention relates to a green preparation method of levoglucosone having a high added value. The green preparation method comprises the following steps that 1, cellulose or wood fiber-like biomass contacts with a phosphate, the phosphate is a monophosphate or a phosphate-containing mixture, and a mass ratio of the phosphate to the wood fiber-like biomass mixed mechanically is in a range of 0.01: 1-100: 1; and 2, under the oxygen-free condition, the mixture obtained by the step 1 is subjected to pyrolysis at a temperature of 200-700 DEG C for more than 0.0001s; the pyrolysis product is condensated; and the condensate is collected; and levoglucosone is separated from the condensate. The wood fiber raw material is common and can be obtained easily. The phosphate has a low price, good stability and a low pyrolysis temperature. Levoglucosone has high selectivity. Through use of the phosphate which has a low price and can be recycled, a production cost, acid corrosion and acid pollution are reduced. The green preparation method is a green, economic and effective method for preparing levoglucosone.

The invention belongs to the field of utilization of biomass energy, and particularly relates to a titanium-based magnetic solid super-acid catalyst and a preparation method thereof and a method for preparing laevoglucose ketone by means of catalytic pyrolysis of cellulose or biomass through the catalyst. The titanium-based magnetic solid super-acid catalyst is a composite catalyst utilizing SO42-/TiO2 which is accelerated by sulfate radical as a catalytic active component and utilizing Fe3O4 as a magnetic matrix. The preparation method includes steps of mechanical mixing of cellulose or biomass, quick pyrolysis on anaerobic condition at the temperature of 280 DEG C to 450 DEG C and condensation of pyrolysis gas, and finally liquid product rich in laevoglucose ketone can be obtained. The laevoglucose ketone in the liquid product which is generated by utilizing the magnetic solid super acid catalyst to realize pyrolysis of cellulose or biomass is high in productivity and purity. In addition, the catalyst can be separated and recycled from solid residues by the aid of an external magnetic field directly.

Belonging to the utilization field of biomass energies, the invention specifically relates to a method for preparing levoglucosenone by utilizing a magnetic solid phosphoric acid catalyst for catalytic pyrolysis of cellulose/biomasses. The method comprises: taking magnetic solid phosphoric acid as the catalyst, which is then mechanically mixed with cellulose/biomasses, then conducting rapid pyrolysis under an anaerobic condition at a temperature of 280-450DEG C, and carrying out condensation on pyrolysis gas, thus obtaining a liquid product rich in levoglucosenone. In the liquid product of magnetic solid phosphoric acid catalyzed pyrolysis of cellulose, the yield and purity of levoglucosenone are both high. In addition, being stable in performance, the catalyst can be separated and recovered from solid residue by directly utilizing an external magnetic field and can be recycled repeatedly.

The invention relates to the field of preparation of organic matters, and in particular relates to a method for preparing levoglucose ketone by catalytic pyrolysis of a biomass. The method comprises the following steps: by taking zinc chloride sludge carbon as a catalyst, carrying out pyrolysis at 270-400 DEG C under an anaerobic condition by mixing the catalyst with the biomass mechanically; and collecting a condensed liquid to obtain a liquid product rich in levoglucose ketone. According to the method provided by the invention, the catalyst and the biomass raw materials are low in price, easily available and free from corrosion to pyrolysis equipment, so that the production cost is relatively lower. In addition, the zinc chloride sludge catalyst is stable in performance and can be recycled for times.

The invention belongs to the field of biomass energy utilization and particularly relates to a preparation method of a pyrolytic carbon-modified catalyst, and a method for preparing levorodextrone by catalyzing pyrolytic cellulose by using the catalyst. The pyrolytic carbon-modified catalyst is a composite catalyst formed by activating activated carbon generated by pyrolyzation of the cellulose as a carrier by using a sulfuric acid; and the pyrolytic carbon-modified catalyst and the cellulose are quickly catalyzed and pyrolyzed at 300-400 DEG C in an oxygen-free environment in a fixed bed reactor to obtain a liquid product containing levorodextrone. Levorodextrone is high in yield and high in purity. In addition, the catalyst is cheap and easy to prepare, does not need to be separated from a pyrolytic residue of the cellulose, and can be further processed for further use.

Provided herein are synthetic methods for preparing a compound of formula (I): Also provided herein are synthetic methods for preparing a compound of formula (XIII): The disclosure also provides useful intermediates, derivatives, prodrugs, and pharmaceutically acceptable salts, solvates and hydrates of the formula (I) and formula (XIII) compounds. These compounds are useful for treating diseases associated with molybdenum cofactor deficiency.

The invention discloses a method for preparing levoglucosenone. The method comprises the following steps: grinding and mixing waste strongly acidic macroporous resin Amberlyst-15 and cellulose powder according to a mass ratio of (0.1-1): 1, and carrying out co-pyrolysis in an oxygen-free environment at 250-450 DEG C to prepare the levoglucosenone. According to the method, the waste strongly acidic macroporous resin Amberlyst-15 and the cellulose are subjected to co-pyrolysis treatment, so that the selective conversion of the cellulose to levoglucosenone can be promoted, and the green resource utilization and treatment of the waste resin high polymer can be realized. The method is simple and easy to implement, and can be further popularized and applied to pyrolysis conversion of other wood fiber biomass resources and green resource reutilization and co-treatment of waste resin.