Mini Project

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  • Topic: Adsorption, Zeolite, Natural gas
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  • Published : March 18, 2013
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mini project

Mini Project (RDD-750) Project Title:
Design of Pressure Swing Adsorption system for removal of CO2 and H2S from biogas using zeolites.

______________________ Guided By : Prof. V. K. Vijay C.R.D.T. IIT-Delhi

Submitted By: Vikas Tiwari Dept. of Chemical Engineering IIT- Delhi

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Table of Contents

Table of contents…………………………………………………………………...1 ABSTRACT………………………………………………………………………..2 1. Objectives of the project. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 2.Introduction to PSA system……………………………………………………....3 3. Advantages of PSA over conventional methods to remove CO2. . . . . . . . . . . . .4 4.Zeolite used for CO2 and H2S removal and its properties………………….........4 5. Selection of adsorbent on the basis of nature of adsorbent ................................5 6. Zeolite used for CO2 and H2S removal and its properties:................................5 7. Principles of adsorption..………………………………….................................6 8. Design requirements............................................................................................7 9. Design Calculations.............................................................................................8 10. Conclusion.......................................................................................................12 11. References........................................................................................................13

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ABSTRACT
This project concentrates on the design of pressure swing adsorption system for the removal of CO2 and H2S gases from biogas produced. There is large amount of CO2 is present in biogas, removal of which increases the calorific value of the biogas to extent of natural gas. Project also illustrates the potential of different zeolites to adsorb certain gases specifically. So we will be using Zeolite 13X for the removal of CO2 and H2S in the pressure swing adsorption system.

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Objectives of the project :

Main objectives of the project can be specified as: Reading and understanding of the pressure swing adsorption system for the selective adsorption of gases from mixture of gases. Design of pressure swing adsorption system for removal of H2S and CO2 from biogas using zeolite 13X as adsorbant for volumetric flow rate of 20m3/hr of biogas.

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Need of removal of CO2 and H2S from biogas:

Typical composition of biogas consists around 40% CO 2 and 1000ppm of H2S . So to improve calorific value of biogas to significant amount we need to remove this CO2 from the biogas and increase percentage of methane to around 95%. H2S increases corrosion and foul smeel in the gas so we have to remove H2S also. A typical composition of biogas is given in table 1. CH4 vol % CO2 vol % H2S conc. 50-60% 35-40% 1000 ppm

Table 1. Biogas Composition in terms of CO2 and H2S

And the extent we want to purify this biogas is composition of natural gas so we can use biogas in different applications. Typical composition of natural gas is given in table 2: CH4 vol % CO2 vol % H2S conc. 87-95% 2-4% 25 ppm

Table 2. Natural gas Composition in terms of CO2 and H2S

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Introduction of pressure swing adsorption:

Pressure swing adsorption (PSA) is a technology used to separate some gas species from a mixture of gases under pressure according to the species' molecular characteristics and affinity for an adsorbent material. Special adsorptive materials (e.g. zeolites) are used as a molecular sieve, preferentially adsorbing the target gas species at high pressure. The process then swings to low pressure to desorb the adsorbent material [1].

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Pressure swing adsorption processes rely on the fact that under pressure, gases tend to be attracted to solid surfaces, or "adsorbed". The higher the pressure, the more gas is adsorbed; when the pressure is reduced, the gas is released, or desorbed. PSA processes can...
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