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Study on Desulfurization of C5 Fraction

Author: ZhaoYingWu
Tutor: ChenJiXiang；WangFuShan
School: Tianjin University
Course: Chemical Engineering
Keywords: C5 Sulfide Thiophene Deep Desulfurization Adsorption
CLC: TQ221.211
Type: Master's thesis
Year: 2009
Downloads: 72
Quote: 0
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Abstract


C5 petroleum hydrocarbon fraction is ethylene pyrolysis process, by-product, cleavage of C5 complex composition, containing about 20 kinds of compounds, the larger the content of isoprene, cyclopentadiene and piperylene. They chemically active, are very valuable basic organic chemical raw materials. C5 cleavage has become full advantage of the utilization of petroleum resources and improving economic efficiency ethylene production is an important aspect. With world oil resources have been depleted, petroleum hydrocarbons in increasingly high sulphide content. As for the C5 fraction sulfide catalyst during hydrogenation with severe toxic effects, explore effective method of desulfurization sorbent development of great significance. In this paper, petroleum hydrocarbon desulfurization desulfurization and the latest developments in a more comprehensive commentary summarizes the desulfurization technology in recent years, especially liquid petroleum hydrocarbon desulfurization latest achievements. Although conventional hydrodesulfurization can be very effective for removing most of the sulfur compounds, but it is difficult to achieve deep desulfurization. People in the study currently nonhydrodesulfurization technologies such as adsorption desulfurization, desulfurization and bio-oxidative desulfurization, desulfurization adsorbent which is considered the most likely to achieve industrialization deep desulfurization technology. C5 sulfides can be used in the selective adsorption method removal. However, there are not formed C5 fraction desulfurization related technologies. Firstly, Lanzhou cracker feedstock C5 fraction preliminary analysis, the results showed that isoprene content of 15% -20%, piperylene content of 10% -17%, cyclopentadiene / dicyclopentadiene content of 15% -17%. Three kinds of C5 diolefins representing 40-55% of the total fraction. Combined with GC-PFPD system for C5 olefins to distinguish between various types of organic sulfur compounds. Comparing the GC-PFPD Microcoulometry in law and quantitative analysis of trace sulfide accuracy and precision, confirming the GC-PFPD for total sulfur content analysis and quantitative analysis of each component of the feasibility of sulfides. Analysis of the samples showed C5, organic sulfides mainly in the form of thiophene and its derivatives present, but also the part containing sulfides minimum. C5 fraction discussed during the hydrogenation activity of the catalyst decrease was mainly attributable to a decline in catalyst activity was mainly due to raw material double alkenes and alkynes Qiju Sheng into oligomers covering the active site of the catalyst, the catalyst activity as the catalyst surface oligomer formation and showed an increase in the trend of slow decline. Therefore, in addition to the desulfurization of alkynes in the C5. In this paper the main directions will be positioned in the adsorption process design optimization. Adsorbents selected for the actual Desulfurization C5, comparison found, AD-1 desulfurization sorbent showed good results. This arrangement of two single factor experiments and orthogonal experimental study C5 desulfurization optimum conditions. Using a fixed bed reactor, dynamic tests, the effects of temperature, pressure and space velocity effect on the desulfurization sorbent. The experimental system, the preferred operating parameters of the design are: adsorption temperature 360 ??℃, the adsorption pressure is 0.8 MPa, LHSV 1h-1. Taking into account the amount of processing selected for this study adsorption space velocity 1.5 h-1. AD-1 under the set conditions sorbent desulfurization rate can exceed 90% of the sulfur content of about 2.23%. The results showed that, AD-1 has a high desulfurization activity, C5 olefins, sulfur content to 5μg / g or less, and does not change the nature of C5.

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CLC: > Industrial Technology > Chemical Industry > Basic Organic Chemistry Industry > The production of aliphatic compounds ( acyclic compounds) > Aliphatic hydrocarbons > Unsaturated lipid hydrocarbon > Monoolefins > Ethylene
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