Abstract: Provided is a method for pretreating waste fat, oil and grease (FOG) and co-producing a first-generation biodiesel, including: S1, feeding waste FOG, a liquid acid catalyst, and methanol into a pre-esterification reactor, and conducting pre-esterification to obtain a pre-esterification mixed liquid; S2, removing waste residues from the pre-esterification mixed liquid through a filter to obtain a filtrate, and separating the filtrate by a liquid-liquid separator to obtain an organic phase and an aqueous phase; S3, introducing the organic phase into a methanol recovery tower I and conducting separation to obtain a pre-esterification product and crude methanol; introducing the aqueous phase into a methanol recovery tower II and conducting another separation to obtain a liquid acid catalyst and crude methanol; S4, separating the pre-esterification product through a biodiesel refining tower to obtain a first-generation biodiesel product, and a pretreated waste FOG at a tower bottom.

Abstract: A coupling process for producing biodiesel from a waste FOG including: among others, 1) removing solid impurities from a waste FOG, then mixing with an alcohol and liquid acid catalyst to generate a pre-esterified mixture; 2) mixing the mixture with water, and charging the mixture to separate an aqueous phase to remove metal ions to obtain an esterification product II; 3) mixing the product II with a vulcanizator and H2 to generate a product I; 4) and separating the product I to obtain an oil phase, mixing the oil phase with H2 and passing the mixture into a fixed-bed reactor, and using a gas-liquid separator for separation to obtain an oil phase product II.

Abstract: A catalyst for chemical pretreatment of waste fat, oil and/or grease, and a preparation method and use thereof. The catalyst includes three components of component A, component B, and component C; wherein the component A is a Bronsted acid protic ionic liquid composed of a linear or heterocyclic tertiary amine cation and an anion, the component B is at least one selected from the group made of organic acid and inorganic acid; the component C is at least one selected from low-carbon alcohols; and a mass ratio of the component A, the component B and the component C is in a range of (1.0-4.0):(0.01-0.3):(1.0-6.0). The catalyst is prepared by subjecting corresponding anions and cations to one-step neutralization reaction to obtain component A, and then mechanically mixing component A, and components B and C.

Abstract: Provided is a method for pretreating waste fat, oil and grease (FOG) and co-producing a first-generation biodiesel, including: S1, feeding waste FOG, a liquid acid catalyst, and methanol into a pre-esterification reactor, and conducting pre-esterification to obtain a pre-esterification mixed liquid; S2, removing waste residues from the pre-esterification mixed liquid through a filter to obtain a filtrate, and separating the filtrate by a liquid-liquid separator to obtain an organic phase and an aqueous phase; S3, introducing the organic phase into a methanol recovery tower I and conducting separation to obtain a pre-esterification product and crude methanol; introducing the aqueous phase into a methanol recovery tower II and conducting another separation to obtain a liquid acid catalyst and crude methanol; S4, separating the pre-esterification product through a biodiesel refining tower to obtain a first-generation biodiesel product, and a pretreated waste FOG at a tower bottom.

Abstract: A chemical pretreatment process for waste fat, oil and/or grease (FOG) includes three working sections: first, subjecting the waste FOG to esterification reaction to prepare a fatty acid methyl ester; second, subjecting a crude product obtained from the esterification reaction and a catalyst to liquid-liquid phase separation through a chromatograph device to obtain a crude product solution in a form of oil phase and a catalyst solution in a form of aqueous phase, respectively separating the aqueous phase and the oil phase through evaporation systems to obtain a crude product, catalyst and methanol and water, storing temporarily the crude product in a storage tank, and recycling the catalyst back to the reactor; and finally, refining the methanol aqueous solution through a distillation tower to obtain high-purity methanol, which is returned to the reactor for recycling, and introducing a resulting wastewater to a storage tank.

Abstract: Provided is a chemical pretreatment system for waste fat, oil and grease (FOG), including: a catalyst preparation device; a first esterification reactor; a first separation device; a second separation device; an evaporation device set; a cooling device; and a methanol separation device. The first separation device is connected with an outlet of the first esterification reactor and connected with an inlet end of the second separation device. The second separation device is connected with an evaporation device by a first outlet and with another evaporation device by a second outlet. Outlets of multiple evaporation devices simultaneously connect with the cooling device which connects with the methanol separation device. A reflux device is connected with an outlet of the methanol separation device and also connected with the first esterification reactor.

Abstract: A coupling process for producing biodiesel from a waste FOG including: among others, 1) removing solid impurities from a waste FOG, then mixing with an alcohol and liquid acid catalyst to generate a pre-esterified mixture; 2) mixing the mixture with water, and charging the mixture to separate an aqueous phase to remove metal ions to obtain an esterification product II; 3) mixing the product II with a vulcanizator and H2 to generate a product I; 4) and separating the product I to obtain an oil phase, mixing the oil phase with H2 and passing the mixture into a fixed-bed reactor, and using a gas-liquid separator for separation to obtain an oil phase product II.

Abstract: The invention discloses a method for preparing maleate by selective catalytic oxidation of lignin. The method uses a heteropolyacid functionalized ionic liquid as a catalyst, and an aqueous alcohol solution as a reaction medium to achieve high-efficiency selective catalytic conversion and ring opening oxidation of biomass lignin at a reaction temperature of 110-160° C. and an oxygen pressure of 0.5-1.0 MPa for 1-6 h. The selectivity of maleate is higher than 47.83%. The yield and selectivity of a single chemical derived from the depolymerization of lignin in the present invention are much higher than the prior art, and the ionic liquid catalyst exhibits outstanding advantages such as availability of recovery and recycling through simple temperature adjustment; the reaction conditions of the present invention are mild, and the process is green and safe, easy to operate, and available for batch and continuous production.

Abstract: The present invention discloses a method for preparing p-hydroxycinnamate by using an ionic liquid for catalytic lignin depolymerization comprising: 1) preparation of a halogen metal-based ionic liquid: preparing the halogen metal-based ionic liquid by reacting an alkylimidazole chloride with a metal chloride by heating the same to 30° C. to 80° C. with stirring; and 2) catalytic depolymerization of lignin: mixing the halogen metal-based ionic liquid and lignin with an alcohol, and after N2 replacement, heating the solution to 140° C. to 200° C. and reacting the solution for 4-8 h while stirring to prepare high value-added chemicals with p-hydroxycinnamate as a main product. The present invention has advantages of a simple process, mild conditions, environmental kindness, and high selectivity for a main product. The ionic liquid is simple in preparation, has a good atom economy, and is recyclable. Under optimal conditions, the yield of p-hydroxycinnamate can reach 40-80 mg/g.

Abstract: The present invention discloses a method for preparing p-hydroxycinnamate by using an ionic liquid for catalytic lignin depolymerization comprising: 1) preparation of a halogen metal-based ionic liquid: preparing the halogen metal-based ionic liquid by reacting an alkylimidazole chloride with a metal chloride by heating the same to 30° C. to 80° C. with stirring; and 2) catalytic depolymerization of lignin: mixing the halogen metal-based ionic liquid and lignin with an alcohol, and after N2 replacement, heating the solution to 140° C. to 200° C. and reacting the solution for 4-8 h while stirring to prepare high value-added chemicals with p-hydroxycinnamate as a main product. The present invention has advantages of a simple process, mild conditions, environmental kindness, and high selectivity for a main product. The ionic liquid is simple in preparation, has a good atom economy, and is recyclable. Under optimal conditions, the yield of p-hydroxycinnamate can reach 40-80 mg/g.

Abstract: The invention discloses a method for preparing maleate by selective catalytic oxidation of lignin. The method uses a heteropolyacid functionalized ionic liquid as a catalyst, and an aqueous alcohol solution as a reaction medium to achieve high-efficiency selective catalytic conversion and ring opening oxidation of biomass lignin at a reaction temperature of 110-160° C. and an oxygen pressure of 0.5-1.0 MPa for 1-6 h. The selectivity of maleate is higher than 47.83%. The yield and selectivity of a single chemical derived from the depolymerization of lignin in the present invention are much higher than the prior art, and the ionic liquid catalyst exhibits outstanding advantages such as availability of recovery and recycling through simple temperature adjustment; the reaction conditions of the present invention are mild, and the process is green and safe, easy to operate, and available forbatch and continuous production.