Process for producing ethylene from an ethanol feedstock
A raw material, ethanol technology, which is applied in the field of ethylene production, can solve the problems of affecting catalyst performance and poor catalyst stability, and achieve the effects of reducing energy consumption, high ethylene selectivity, and reducing reaction temperature
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[0052] The preparation method of the supported heteropolyacid salt catalyst comprises the following steps: (1). Provide a supported heteropolyacid catalyst, wherein, the supported heteropolyacid catalyst contains a heteropolyacid and supports the heteropolyacid Carrier; (2). Provide a metal salt solution, wherein the type of metal is selected from the group consisting of copper, silver, gold, zinc, cadmium and mercury; and (3). Make the loaded heteropolyacid The catalyst is reacted with the metal salt solution to obtain a crude product, and the supported heteropolyacid salt catalyst is obtained after drying the crude product.
[0053] Preferably, the preparation method of the supported heteropolyacid catalyst is such as but not limited to incipient wetness impregnation (incipient wetness impregnation), and its specific steps are described in detail as follows: (1). Dissolving the heteropolyacid in water to obtain the heteropolyacid A polyacid solution; and (2). Mixing the hete...
Embodiment 1
[0073] 0.189 g of silver nitrate was dissolved in 3 ml of distilled water to obtain a silver nitrate solution. The silver nitrate solution was slowly dropped into a supported silicotungstic acid catalyst with a total weight of 12 g and stirred evenly to obtain a crude product. After the crude product is placed in an oven and dried at 130°C, a supported silver silicotungstate catalyst is obtained [silicotungstate silver salt compound is (AgH 3 )SiW 12 o 40 , The content of silver is 1wt%]. 3ml of the supported silver silicotungstate catalyst was placed in a fixed bed reactor. Use a liquid control pump to pump 95% (v / v) ethanol into a preheating tank to vaporize into ethanol gas, and use nitrogen as the carrier gas (humidity 5%) to carry the ethanol gas into the fixed bed reactor, at a space velocity of 1h -1 1. The dehydration reaction of ethanol was carried out under the condition that the reaction temperature was 220° C. and the reaction pressure was 0.1 MPa, and the gas...
Embodiment 2
[0075] 0.992 g of silver nitrate was dissolved in 3 ml of distilled water to obtain a silver nitrate solution. The silver nitrate solution was slowly dropped into a supported silicotungstic acid catalyst with a total weight of 12 g and stirred evenly to obtain a crude product. After the crude product is placed in an oven and dried at 130°C, a supported silver silicotungstate catalyst is obtained [silicotungstate silver salt compound is (AgH 3 )SiW 12 o 40 , The silver content is 5wt%]. 3ml of the supported silver silicotungstate catalyst was placed in a fixed bed reactor. Use a liquid quality control pump to pump 95% (v / v) ethanol into a preheating tank to vaporize into ethanol gas, and use nitrogen as a carrier gas (humidity 5%) to bring ethanol gas into the fixed In a bed reactor, at a space velocity of 1 h -1 1. The dehydration reaction of ethanol was carried out under the condition that the reaction temperature was 200° C. and the reaction pressure was 0.1 MPa, and th...
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