CN-122006596-A - Biomass sugar solution stripping-hydrogenation device and biomass sugar hydrogenation process

Abstract

The invention discloses a biomass sugar solution stripping-hydrogenation device and a biomass sugar hydrogenation process, wherein the biomass sugar solution stripping-hydrogenation device comprises a stripping reaction kettle, a feeding pipe is arranged at the top of the stripping reaction kettle, and a hydrogen feeding pipe is arranged at the bottom of the stripping reaction kettle; the device comprises a stripping reaction kettle, a fixed bed hydrogenation reactor, a cooler, a gas-liquid separator and a gas-liquid separator, wherein the stripping reaction kettle is communicated with the fixed bed hydrogenation reactor, the cooler is communicated with the fixed bed hydrogenation reactor, and the gas-liquid separator is communicated with the cooler. The invention realizes the in-situ conversion of the heat-sensitive saccharide derivative through the coupling of the steam stripping and the hydrogenation process, solves the problems of difficult separation, easy heat coking and the like of the saccharide derivative, and provides a new process for continuously preparing biomass energy and chemicals with high selectivity and low energy efficiency through the integration of hydrogen circulation, heat coupling and process technology.

Inventors

• HUO LIJUN
• SHI WEI

Assignees

• 江苏博涛智能热工股份有限公司

Dates

Publication Date

20260512

Application Date

20260128

Claims (10)

1. 1. A biomass sugar solution stripping-hydrogenation apparatus, characterized in that the biomass sugar solution stripping-hydrogenation apparatus comprises: The stripping reaction kettle is provided with a feeding pipe at the top and a hydrogen feeding pipe at the bottom; the fixed bed hydrogenation reactor is communicated with the stripping reaction kettle; the cooler is communicated with the fixed bed hydrogenation reactor; and the gas-liquid separator is communicated with the cooler.
2. 2. The biomass sugar solution stripping-hydrogenation device according to claim 1, wherein a loop pipe is arranged in the stripping reaction kettle, a plurality of air outlets are arranged on the loop pipe, and the loop pipe is communicated with a hydrogen inlet pipe.
3. 3. The biomass sugar solution stripping-hydrogenation apparatus according to claim 1, further comprising a heat exchanger in communication with the stripping reactor and the fixed bed hydrogenation reactor.
4. 4. The biomass sugar solution stripping-hydrogenation apparatus according to claim 1, further comprising a hydrogen regenerator in communication with said gas-liquid separator and a hydrogen recycle compressor in communication with the hydrogen regenerator and the hydrogen inlet pipe.
5. 5. The biomass sugar solution stripping-hydrogenation apparatus according to claim 1, further comprising a feed tank and a feed transfer pump in communication with said feed tank and the stripping reactor.
6. 6. A biomass sugar hydrogenation process, characterized in that it uses the biomass sugar solution stripping-hydrogenation apparatus according to claim 1, comprising in particular the following steps: feeding the biomass sugar solution into a stripping reaction kettle filled with an acid catalyst through a feed pipe, and feeding hydrogen into the stripping reaction kettle from a hydrogen feed pipe to carry out dehydration reaction on the biomass sugar solution to obtain a dehydration product; Feeding the mixed gas of the dehydrated product and hydrogen output from the top of the stripping reaction kettle into a fixed bed hydrogenation reactor filled with a hydrogenation catalyst for hydrogenation reaction to obtain a hydrogenation product; and (3) conveying the hydrogenation product into a cooler for cooling, then conveying the hydrogenation product into a gas-liquid separator for gas-liquid separation, and obtaining a liquid phase which is the hydrogenation product.
7. 7. The process for hydrogenating biomass sugar according to claim 6 wherein said biomass sugar is at least one of xylose and glucose and/or, The biomass sugar solution is an aqueous solution with the concentration of 5-10wt%.
8. 8. The biomass sugar hydrogenation process according to claim 6, wherein said acid catalyst is at least one of a liquid acid catalyst and a solid acid catalyst, wherein said acid catalyst is at least one of hydrochloric acid, sulfuric acid, phosphoric acid, nitric acid, formic acid, acetic acid, p-toluenesulfonic acid, methanesulfonic acid, oxalic acid, and wherein said solid acid catalyst is at least one of Sn-Beta zeolite, H-BEA, H-ZSM-5, H-Y, sulfonated graphene, sulfonated graphite carbon, and/or, The dosage of the acid catalyst is 2% -6% of the mass of the biomass sugar solution.
9. 9. The biomass sugar hydrogenation process according to claim 6, wherein the hydrogenation catalyst uses Nb 2 O 5 、TiO 2 or ZrO 2 as a carrier, and Ni metal, pt metal or Ru metal is supported on the carrier; wherein the loading amount of the Ni metal on the carrier is 5-15 wt%, and the loading amount of the Pt metal or Ru metal on the carrier is 1.0-5.0 wt%.
10. 10. The process for hydrogenating biomass sugar according to claim 6 wherein the reaction temperature in the stripping reactor is 150 ℃ to 200 ℃ and the reaction pressure is 1.0MPa to 3.0MPa, the residence time of the biomass sugar solution in the stripping reactor is 30min to 100min, and/or, In the fixed bed hydrogenation reactor, the reaction temperature is 160-240 ℃, the reaction pressure is 1.0-3.0 MPa, and the weight space velocity is 0.5h -1 -2.0h -1 .

Description

Biomass sugar solution stripping-hydrogenation device and biomass sugar hydrogenation process Technical Field The invention belongs to the technical field of energy and chemical industry, and particularly relates to a biomass sugar solution stripping-hydrogenation device and a biomass sugar hydrogenation process. Background Biomass sugars are a widely available, renewable and continuously recyclable carbon source in nature, with xylose and glucose being the most important available components. Through acid catalytic dehydration reaction, xylose can be efficiently converted into furfural, glucose can be converted into HMF (5-hydroxymethylfurfural), and the xylose and the glucose both belong to furan platform compounds with high reactivity and can be used as important intermediates for preparing various bio-based chemicals at the downstream. Furfuraldehyde can be further hydrogenated to produce furfuryl alcohol or cyclopentanone is prepared by hydrogenolysis-rearrangement reaction, and HMF can be hydrogenated or reformed to obtain high added value chemicals such as adipone, furandimethanol and the like. Therefore, developing efficient processes for the direct preparation of furfural/HMF from sugars and further conversion to downstream hydrogenation products is an important research direction in the current biomass chemical industry field. At present, acid catalytic dehydration technology is generally adopted for preparing furfural or HMF from saccharides, and products are easily influenced by condensation and resinification in the reaction process, so that the yield is low. In order to improve the yield, the traditional process adopts solvent extraction, reduced pressure distillation or high temperature gas stripping and other modes to remove the generated furfural or HMF from the reaction system in time. However, such separation steps are generally separated from hydrogenation steps, the process flow is long, multiple sets of reactors and separation equipment are needed, the processing cost is high, the energy utilization efficiency is low, and the product is easy to generate side reaction in a multistage process, so that the overall yield is affected. On the other hand, hydroconversion of furfural and HMF is typically carried out using a fixed bed hydrogenation reactor or batch hydrogenation kettle. Because the boiling points of furfural and HMF are higher, the furfural and HMF are not easy to directly enter a hydrogenation bed in a gas phase form, and the prior art generally adopts a series process of separating before hydrogenating. The process flow generally has the problems of large equipment quantity, longer flow, high energy consumption and high investment cost, meanwhile, the intermediate products are easy to oxidize or resinify in the condensation, collection and transfer processes, so that the purity of the subsequent hydrogenation products is reduced, and in addition, the process sections are mutually independent, so that the efficient recycling of hydrogen is difficult to realize, continuous and stable operation is not facilitated, and the overall energy efficiency is limited. Disclosure of Invention The invention aims to provide a biomass sugar solution stripping-hydrogenation device and a biomass sugar hydrogenation process, which can realize the cooperative operation of sugar dehydration and hydrogenation, improve the production efficiency and have high-efficiency sugar conversion and hydrogenation catalysis performance. In order to achieve the above object, a specific embodiment of the present invention provides the following technical solution: A biomass sugar solution stripping-hydrogenation apparatus, the biomass sugar solution stripping-hydrogenation apparatus comprising: The stripping reaction kettle is provided with a feeding pipe at the top and a hydrogen feeding pipe at the bottom; the fixed bed hydrogenation reactor is communicated with the stripping reaction kettle; the cooler is communicated with the fixed bed hydrogenation reactor; and the gas-liquid separator is communicated with the cooler. In one or more embodiments of the present invention, a loop is provided inside the stripping reaction kettle, and a plurality of air outlets are provided on the loop, and the loop is communicated with a hydrogen inlet pipe. In one or more embodiments of the invention, the biomass sugar solution stripping-hydrogenation apparatus further comprises a heat exchanger in communication with the stripping reactor and the fixed bed hydrogenation reactor. In one or more embodiments of the invention, the biomass sugar solution stripping-hydrogenation apparatus further comprises a hydrogen regenerator in communication with the gas-liquid separator and a hydrogen recycle compressor in communication with the hydrogen regenerator and the hydrogen inlet pipe. In one or more embodiments of the invention, the biomass sugar solution stripping-hydrogenation apparatus further comprises a feed tank and a feed tran