Simultaneous high-temperature removal of alkali and particulates in a pressurized gasification system. Final technical progress report, April 1981-July 1983

Alumosilicate minerals are suitable sorbents at high temperatures for removing alkalis in syngas. Thermogravimetric investigations of these sorbents usually focus on the reaction mechanisms. Herein, a crucible arrangement is described that allows evaporation of the alkali source and sorption of gaseous alkali components in one temperature zone. With this experimental setup, kinetic investigations of alkali sorption are possible in a conventional thermobalance. Experiments were performed with sodium chloride as the alkali source and kaolin as the getter material. The reaction rate increased with alkali concentration and showed an exponential dependence on temperature. Thus, the Arrhenius model approach and power law model were selected for mathematical description.

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“…During this process, the alkali atoms are embedded irreversibly in the getter matrix according to Eq. .

true \begin{matrix} right1 & left 2 normalMeCl + 2 {normalH}_{2} normalO + normalA {normall}_{2} {normalO}_{3} \cdot x normalSi {normalO}_{2} \to normalM {normale}_{2} normalO \cdot normalA {normall}_{2} {normalO}_{3} \cdot x normalSi {normalO}_{2} + 2 normalHCl \end{matrix}

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Section: Introductionmentioning

confidence: 99%

The Reaction Kinetics of Gaseous Alkali Capture by Kaolin in Syngas Atmosphere

Kerscher¹,

Stetka²,

Spliethoff

2018

Chem Eng & Technol

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“…Sorbents include a variety of natural minerals such as diatomaceous earth (silicas), clays, or kaolinite. Sorbent can also be synthesized such as activated alumina from bauxite minerals [58,89,187]. Minerals such as kaolinite and bauxite are capable of high temperature (1000°C) removal applications both inside and downstream of the gasifier.…”

Section: Sulfurmentioning

confidence: 99%