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Synthesis method for producing ethylene with high-efficiency dehydration of biological ethyl alcohol

A technology for bioethanol and synthesis methods, which is applied in chemical instruments and methods, hydrocarbon production from oxygen-containing organic compounds, and bulk chemical production, etc., can solve the problems of reducing ethylene yield and increasing the burden of wastewater treatment, and achieves high selectivity. , Easy to operate, good thermal stability

Inactive Publication Date: 2008-08-20
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In addition, due to the application of micron grain ZSM-5 catalyst in the process of catalyzing ethanol dehydration to ethylene, there are a large number of oil layers in the liquid discharge, which reduces the yield of ethylene and increases the burden of wastewater treatment, so micron grain ZSM- 5 The catalyst has not been widely used in the process of ethanol dehydration to ethylene

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] SiO 2 : Al 2 o 3 =26 (molar ratio), HZSM-5 molecular sieve (powder) with a grain size of 50-100 nanometers and α.Al 2 o 3 .H 2 O (powder) is added 3.0% of the dry basis weight of scallop powder and 12% (V / V) nitric acid aqueous solution in the mixture of dry basis weight ratio 70:30 composition, mixes and extrudes into strips, in 85 ℃ thermostat After drying in medium for 8 hours, the sample was placed in a muffler furnace, and the temperature was raised from 30°C to 540°C at a rate of 6°C / min and kept at 540°C for 3 hours and then lowered to room temperature, which was designated as Catalyst A.

[0026] Put 1 gram (g) of catalyst A sample into the middle part (constant temperature section) of a stainless steel tubular reactor with a length of 40 cm and an inner diameter of 0.8 cm, and the non-constant temperature section of the reactor is filled with inert ceramic balls. Under the protection of nitrogen gas of 0.25Mpa (gauge pressure), after activation at 450°C (c...

Embodiment 2

[0042] SiO 2 : Al 2 o 3 =26 (molar ratio), HZSM-5 molecular sieve (powder) with a grain size of 50-100 nanometers and α-Al 2 o 3 .H 2 O (powder) is added 3.0% of the dry basis weight of scallop powder and 12% (V / V) nitric acid aqueous solution in the mixture of dry basis weight ratio 70:30 composition, mixes and extrudes into strips, in 85 ℃ thermostat After 8 hours of medium drying, the sample was placed in a muffler furnace, and the temperature was raised from 30°C to 540°C at a rate of 6°C / min and kept at 540°C for 3 hours before cooling down to room temperature. The sample was then placed at a temperature of 410°C at a space velocity of 2h -1 After the water vapor was treated with water vapor for 3.5 hours, it was lowered to room temperature, and it was recorded as catalyst B. The application method is exactly the same as in Example 1, the partial pressure of ethanol in the preheating section of the reactor is 86Kpa, and the conversion rate of ethanol>99% and the sel...

Embodiment 3

[0057] SiO 2 : Al 2 o 3 =26 (molar ratio), HZSM-5 molecular sieve with grain size of 50-100 nanometers and α.Al 2 o 3 .H 2 O add 3.0% kale powder and 12% (V / V) nitric acid aqueous solution by dry weight to the mixture composed of dry weight ratio 70:30, mix evenly and extrude into strips, dry in 85°C thermostat for 8 hours Afterwards, the sample was placed in a horse-boiler furnace, and the temperature was raised from 30°C to 540°C at a rate of 6°C / min and kept at 540°C for 3 hours before falling to room temperature. The sample was then placed at a temperature of 410°C at a space velocity of 2h -1 After steam treatment with water vapor for 3.5 hours, it was cooled to room temperature. With this as the matrix, 3% of the matrix weight of cerium oxide (CeO 2 ) converted into equivalent cerium nitrate (Ce(NO 3 ) 3 .6H 2 O), configured as a cerium nitrate solution (the volume ratio of the solution to the catalyst precursor is about 9:1). The catalyst precursor was immers...

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Abstract

The invention provides a synthesis method for dehydrating biological ethanol to prepare ethylene, belongs to the technical field of the synthesis chemical project and relates to a preparation of the ethylene. The invention provides a method for dehydrating the biological ethanol to prepare the ethylene under the function of a nanometer molecular sieve catalyst. Under the normal pressure and in a certain temperature range, a fixed bed reactor which uses the nanometer molecular sieve as the catalyst and uses the liquid biological ethanol as a raw material, and while the inertia gas is used for adjusting the partial pressure of the gas ethanol in the preheating section of the reactor, the desorption of the generated ethylene from the catalyst is strengthened so as to achieve the aim of efficiently dehydrating and synthesizing the ethylene by the ethanol. The synthesis method of dehydrating the biological ethanol to prepare the ethylene of the invention is outstandingly characterized in that: (1) the nanometer molecular sieve is applied in dehydrating the biological ethanol to prepare the ethylene; (2) while the inertia gas is used for adjusting the partial pressure of the gas ethanol, the desorption of the generated ethylene from the catalyst is strengthened; (3) the catalyst is good in stability, reaction is low in temperature, ethanol is high in conversion, ethylene is high in selectivity, environment is not polluted and the process is simple. A nanometer HZSM-5 molecular sieve is used as the catalyst, and 95(v / v) percent of liquid ethanol is used as the raw material (the ethanol weight space velocity is 1.2 hours<-1>), the nitrogen is used for adjusting the partial pressure of the gas ethanol in the preheating section of the reactor, the ethanol conversion is more than 99 percent and the ethylene selectivity is more than 98 percent in the reaction time of 600 hours under the reaction temperature of 240 DEG C.

Description

technical field [0001] The invention belongs to the technical field of synthetic chemical engineering, and relates to a synthetic method for producing ethylene by dehydrating bioethanol. Background technique [0002] The dehydration of ethanol to ethylene can be traced back to 1797. Before 1945, most of the ethylene in the world was produced by dehydration of ethanol. With the rapid development of the petrochemical industry and the emergence of a large amount of cheap oil and natural gas, the thermal cracking of hydrocarbons such as naphtha or natural gas to produce ethylene has gradually replaced the route of ethanol dehydration to ethylene. With the serious harm of greenhouse gas emissions to the human living environment and the depletion of non-renewable fossil resources such as petroleum, especially in recent years, the price of fossil resources such as petroleum has risen sharply, and the route of ethanol dehydration to ethylene has greater development potential and sp...

Claims

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Application Information

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IPC IPC(8): C07C1/24C07C11/04B01J29/06B01J29/40
CPCY02P20/52
Inventor 郭新闻毕见东王祥生
Owner DALIAN UNIV OF TECH
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