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How to clean hydrothermal autoclave reactor?
Hydrothermal synthesis autoclave reactor
has two types – teflon lined (220℃), PPL lined (280℃), below picture showed is teflon lined hydrothermal synthesis autoclave reactor, but the cleaning method is same. -
1) The catalyst of hydrothermal synthesis reaction kettle is silicon system, after use, can add appropriate amount of hydrofluoric acid or alkali heating and washing.
2) If is silicon metal system, it is different from the acid dissolved in the reaction, if is hydrochloric acid, need to use of aqua regia (concentrated nitric acid and concentrated hydrochloric acid in a ratio of 3:1).
For example: after use, dissolve potassium permanganate in water, then add 3-5ml concentrated hydrochloric acid and seal it in the hydrothermal synthesis reactor
. It can be cleaned after hydrothermal reaction at 180℃ for 5-10 hours.2. The cleaning method of hydrothermal synthesis reactor liner (commonly used in laboratory)
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1) Clean with aqua regia (aqua regia: concentrated nitric acid and concentrated hydrochloric acid in 3-1 ratio).
2) After the reaction finished, add a mixture solution of about 1:5 nitric acid and water into the linner of hydrothermal synthesis reactor
, and then heat it to 180℃ for about 12 hours (these data are only for reference). The proportion and temperature of the mixed solution in actual operation can be determined according to the specific conditions of the reaction in the experiment. However, the drawback of this method is that it will make the experiment less repeatable.3) Cook with oxalic acid solution for 6 hours at a temperature about 160 ℃, this is depending on the experiment.
4) Use hydrofluoric acid or ethanol to heat reaction cleaning, or use other strong acids.
Note: low-boiling system which is easy to explode is strictly forbidden in hydrothermal synthesis reactor
.When the hydrothermal synthesis reactor
is used up, the PTFE inner and stainless steel outer coat need to be separated and dried under 50℃. -
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