- Method and system for producing 1, 3-propylene glycol by multi-step method
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The invention discloses a method and a system for producing 1, 3-propylene glycol by a multi-step method. The method comprises the following steps: carrying out dehydration reaction on 1, 3-dichloropropanol and a dehydration catalyst to prepare 1, 3-dichloropropene; carrying out a first hydrolysis reaction on a first mixed reaction system containing the 1, 3-dichloropropene, a first hydrolysis agent and a first solvent to prepare 3-chloro-2-propene-1-alcohol; carrying out hydrogenation reaction on the 3-chloro-2-propene-1-alcohol and a hydrogenation catalyst to prepare 3-chloropropanol; and carrying out a second hydrolysis reaction on a second mixed reaction system containing the 3-chloropropanol, a second hydrolysis agent and a second solvent to prepare the 1, 3-propylene glycol. According to the method, 1, 3-dichloropropanol is used as a raw material, the important chemical raw material 1, 3-propylene glycol is prepared through a dehydration, hydrolysis, hydrogenation and hydrolysisfour-step method, and the method has the advantages of mild reaction conditions, low cost, environmental protection, economy and the like.
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Paragraph 0101-0103; 0110-0112; 0119-0121; 0128-0130
(2021/01/28)
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- Method and system for producing 1, 3-propylene glycol from 1, 3-dichloropropanol
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The invention discloses a method and a system for producing 1, 3-propylene glycol from 1, 3-dichloropropanol. The method comprises the following steps: continuously inputting 1, 3-dichloropropanol into a reaction device provided with a dehydration catalyst for dehydration reaction to prepare 1, 3-dichloropropene; continuously inputting the 1, 3-dichloropropene and hydrogen into a reaction device provided with a hydrogenation catalyst for hydrogenation reaction to prepare 1, 3-dichloropropane; and carrying out hydrolysis reaction on a mixed reaction system containing the 1, 3-dichloropropane, ahydrolysis agent and a solvent to prepare the 1, 3-propylene glycol. According to the method, an intermediate product 1, 3-dichloropropanol of epoxy chloropropane prepared by a cheap glycerol chlorination method is used as a raw material, an important chemical raw material 1, 3-propylene glycol is prepared by three steps of dehydration, hydrogenation and hydrolysis, a new way is provided for preparing 1, 3-propylene glycol from glycerol, and the route has the advantages of mild conditions, low cost, environmental friendliness, economy and the like.
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Paragraph 0083-0085; 0090-0090-0092; 0097-0099; 0104-0106
(2021/03/13)
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- PROCESS FOR THE PRODUCTION OF CHLORINATED AND/OR FLUORINATED PROPENES
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Processes for the production of chlorinated and/or fluonnated propenes provide good product yield with advantageous impurity profiles in the crude product. Advantageously, the processes may be conducted at lower temperatures than 600°C, or less than 500°C, so that energy savings are provided, and/or at higher pressures so that high throughputs may also be realized. The use of catalysts or initiators may provide additional enhancements to conversion rates and selectivity, as may adjustments to the molar ratio of the reactants.
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Page/Page column 13-19
(2013/02/27)
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- Oxychlorination and combustion of propene on fly-ash. Formation of chlorinated benzenes, dibenzodioxines and mono- and dibenzofurans
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Heterogenous gas phase reactions of propene on fly ash in the presence of hydrochloric acid and air between 300-580 deg C have been investigated. At mild conditions only the formation of polychlorinated C1, C2 and C3 species takes place. At the high tempe
- Jarmohamed, W.,Mulder, P.
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p. 1911 - 1918
(2007/10/03)
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