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A kind of alkane dehydrogenation exothermic auxiliary agent and its preparation method and use method

A technology of alkane dehydrogenation and exothermic additives, which is applied in the field of alkane dehydrogenation, can solve problems that are rarely seen in reports, achieve good selectivity, high yield, improve severity and stability

Active Publication Date: 2021-02-02
REZEL CATALYSTS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Related technologies involving the use of exothermic materials to improve the alkane dehydrogenation process have been reported, but catalytic promoter technologies that are more convenient in operation and use, especially those involving multiple combined heat releases, are rarely reported

Method used

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  • A kind of alkane dehydrogenation exothermic auxiliary agent and its preparation method and use method
  • A kind of alkane dehydrogenation exothermic auxiliary agent and its preparation method and use method
  • A kind of alkane dehydrogenation exothermic auxiliary agent and its preparation method and use method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Example 1: The pseudo-boehmite, calcium hydroxide, and copper oxide were stirred evenly, and then slowly added water and mixed evenly, and the material was prepared and formed by the extrusion molding method. The shaped mass was then dried at 60°C for 12 hours. Then, the dried material was calcined at a high temperature of 1200° C. for 4 hours to obtain the desired exothermic auxiliary. The elemental composition of the sample is shown in Table 1, the specific surface area, specific heat capacity and heat of water absorption and heat release are shown in Table 2, and the X-ray diffraction pattern is shown in Table 2. figure 1 , DSC curve see image 3 .

[0039] This sample is used in propane dehydrogenation, and the exothermic aid for alkane dehydrogenation is added to the dehydrogenation catalyst (K 2 O / Cr 2 O 3 / γ-Al 2 O 3 Catalyst with 21.3wt% Cr in the catalyst 2 O 3 ), at a reaction temperature of 600 °C, a reaction pressure of 0.5 MPa, and a volumetric spa...

Embodiment 2

[0040] Example 2: The pseudo-boehmite, calcium oxide, and copper hydroxide were stirred evenly, and then dilute nitric acid with a solubility of 1 wt% was slowly added to mix evenly, and the material was prepared and formed by extrusion molding. The shaped mass was then dried at 60°C for 24 hours. Then, the dried material was calcined at a high temperature of 1000° C. for 3 hours to obtain the desired exothermic auxiliary. The elemental composition of the sample is shown in Table 1, and the specific surface area is shown in Table 2.

[0041] This sample is used in butane dehydrogenation, and the exothermic aid for alkane dehydrogenation is added to the dehydrogenation catalyst (K 2 O / Cr 2 O 3 / γ-Al 2 O 3 Catalyst with 21.3wt% Cr in the catalyst 2 O 3 ), at a reaction temperature of 550°C, a reaction pressure of 0.05MPa, and a volumetric space velocity (LHSV) for 50 hours -1 The contact reaction is carried out under the conditions of 100 °C, the molar ratio of hydrogen ...

Embodiment 3

[0042] Example 3: The pseudo-boehmite, calcium hydroxide, and cuprous oxide were stirred uniformly, and then water was slowly added to mix uniformly, and the material was prepared and formed by the extrusion molding method. The shaped mass was then dried at 80°C for 7 hours. After that, the dried material was calcined at a high temperature of 1300° C. for 6 hours to obtain the desired exothermic auxiliary. The elemental composition of the sample is shown in Table 1, and the specific surface area is shown in Table 2.

[0043] This sample is used in ethane dehydrogenation, and the exothermic aid for alkane dehydrogenation is added to the dehydrogenation catalyst (K 2 O / Cr 2 O 3 / γ-Al 2 O 3 Catalyst with 21.3wt% Cr in the catalyst 2 O 3 ), at a reaction temperature of 700°C, a reaction pressure of 1MPa, and a volumetric space velocity (LHSV) of 0.1 hour -1 The contact reaction is carried out under the conditions of , the molar ratio of hydrogen and ethane is 3, and the re...

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Abstract

The invention relates to the field of alkane dehydrogenation, in particular to an exothermic additive used in the process of alkane dehydrogenation reaction and its preparation method and use method. Its composition is 10-35 wt% CaO, 50-85 wt% Al 2 o 3 , 5-30 wt% of CuO, and 0-3 wt% of metal oxides selected from Group VIII, Group IIB, Group IIIB, and Group VIIB. The additive stores heat during the catalyst regeneration stage and releases heat during the catalytic reaction, thereby inhibiting the temperature drop during the reaction. The main source of heat in additives is: CuO and H 2 The reaction releases heat and generates water, the heat-generating material absorbs water and releases heat, and the additive acts as a heat medium to store part of the heat itself. The additive is used in the process of alkane dehydrogenation to light olefins, which significantly improves the severity and stability of the process operation, making the dehydrogenation reaction activity higher, better selectivity, less carbon deposition, and single-pass reaction propylene yield higher.

Description

technical field [0001] The invention relates to the field of alkane dehydrogenation, in particular to an exothermic additive used in the process of alkane dehydrogenation and its preparation method and use method. Background technique [0002] Propylene is an important petrochemical basic raw material second only to ethylene and has a broad market demand. With the exploitation of shale gas and the maturity of propane dehydrogenation technology, propane dehydrogenation has become a long-term, stable and relatively cheap source of propylene production. At present, a large number of propane dehydrogenation projects have been built and are to be built at home and abroad. Propane dehydrogenation technology and propane dehydrogenation catalysts have broad prospects (economic analysis of propane dehydrogenation units [J]. Contemporary Petroleum and Petrochemical, 2017, 25(5 ):34-39). [0003] Propane dehydrogenation processes mainly include the Oleflex process of Universal Oil Co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/16C09K5/14C07C5/333C07C11/06C07C11/04C07C11/08C07C11/10
CPCC07C5/3332C07C2523/26C09K5/14C09K5/16C07C11/06C07C11/04C07C11/08C07C11/10Y02P20/52Y02P20/584
Inventor 卓润生施宗波梁伟李明阳张青
Owner REZEL CATALYSTS CORP
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