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A kind of device and method for preparing bio-based aldehydes and ketones
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A technology based on aldehydes and ketones and biology is applied in the field of devices for preparing bio-based aldehydes and ketones through autothermal NTP online catalysis-regeneration, which can solve the problems of waste of resources, high energy consumption, poor effect and the like, and achieve the effect of low regeneration temperature.
Active Publication Date: 2022-05-17
JIANGSU UNIV
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[0003] Patent document CN108531204.A describes a device and method for preparing ketone compounds by pyrolysis of biomass. The device uses a two-stage pyrolysis reaction system to perform directional catalytic pyrolysis on biomass raw materials to prepare the required ketone compounds. The heat required for the pyrolysis reaction of the device is generated by heating with thermocouples, which requires high temperature and consumes a lot of energy; the catalyst uses a single catalyst, and the effect is poor; the catalyst cannot be reused, resulting in waste of resources
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Embodiment 1
[0061] With 50g bagasse as raw material, the particle size is 0.6mm, the pyrolysis temperature is 350°C, the catalyst is ZrO2-CeO2, the flow rate of nitrogen is 100mL / min, the flow rate of oxygen in the spiral burner 13 is 200mL / min, and the first-stage condensation is 180 °C, the secondary condensation is 60 °C, and the third condensation is a mixture of ice and water. With the device and method designed above, only the directional pyrolysis reaction can be carried out under the conditions set in this example.
[0062] Biomass pyrolysis reaction will generate multi-component substances, such as alcohols, aldehydes, acids, ketones, benzene rings, phenols, hydrocarbons, etc., among which alcohol → aldehyde → acid → ketone is a gradual oxidation process, adding catalyst can strengthen The oxidative nature of the reaction process makes the reaction more likely to occur and increases the yield of aldehydes and ketones. The reaction path is as follows:
[0063] Aldehydes and keton...
Embodiment 2
[0065] Using 5 groups of 50g bagasse as raw material, the particle size is 0.6mm, the pyrolysis temperature is 350°C, and the catalyst is ZrO 2 -CeO 2 , the nitrogen flow rate is 100mL / min, the oxygen flow rate in the spiral burner 13 is 200mL / min, the oxygen flow rate in the catalytic reactor 12 is 100mL / min, the catalyst regeneration temperature is 300°C, and the discharge frequency of the NTP generator 14 is 7~ 10kHz, the discharge voltage is 17kV ~ 20kV, the first-stage condensation is 180°C, the second-stage condensation is 60°C, and the third-stage condensation is a mixture of ice and water. Through the device and method designed above, five times of pyrolysis, catalysis, and regeneration reactions were carried out under the conditions set in this embodiment. Each pyrolysis, catalysis reaction used a group of 50g bagasse, and the catalyst went through five regeneration reaction cycles. .
Embodiment 3
[0067] The catalyzer that present embodiment selects except that is ZrO 2 -FeO x , all the other conditions are identical with embodiment 2.
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Abstract
A device for preparing bio-based aldehydes and ketones, including pyrolysis reaction system I, NTP catalysis-regeneration reaction system II, product collection system III, NTP catalysis-regeneration reaction system II includes a catalytic reactor, a spiral burner, and an NTP generator And an oxygen supply device, a spiral burner and an NTP generator are arranged outside the catalytic reactor, and the oxygen supply device is connected with the catalytic reactor and the spiral burner respectively. The device realizes self-heating NTP on-line catalysis-regeneration to prepare bio-based aldehydes and ketones, so that the used catalyst can generate high-energy particles and carbon deposits on the active material oxidation catalyst through NTP, and the catalyst can be regenerated. The regeneration temperature is low and the catalyst structure is maintained. In perfect condition, reusable.
Description
technical field [0001] The invention belongs to the technical field of thermochemical conversion of biomass, and in particular relates to a device for preparing bio-based aldehydes and ketones by self-heating NTP online catalysis-regeneration. Background technique [0002] Aldehyde and ketone compounds are an important class of intermediates in the production process of organic chemicals, and are widely used in the synthesis of fine chemical products. At present, the main sources of aldehydes and ketones in the industry: 1. Alcohol oxidation is the main reaction for the synthesis of aldehydes and ketones, and primary alcohols are dehydrogenated to prepare aldehydes; 2. Calcium acetate is obtained from acetic acid, and then heated to 160 to decompose to form acetone and calcium carbonate; 3. In the presence of zinc chromate catalyst, ethanol vapor reacts at high temperature to generate acetone; 4. Liquefied natural gas or naphtha is oxidized into acetone and formaldehyde. Th...
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