摘要:
A used hydrocarbon cracking catalyst is treated with an antimony carbonate to passivate contaminating metals thereon, e.g., vanadium, iron and/or nickel. A process for cracking a hydrocarbon in the presence of the passivated catalyst is also disclosed.
摘要:
A method of restoring activity to a cracking catalyst which has been at least partially deactivated by metals contamination which involves contacting the cracking catalyst with a treating agent comprising a source of aluminum.
摘要:
A used cracking catalyst is treated with antimony carbonate and its thio analogues to passivate contaminating metals whenever these metals have been deposited on the catalyst.
摘要:
A method to restore the activity of a cracking catalyst which has been deactivated at least partially by metals contamination which involves contacting the cracking catalyst with an aluminum containing treating agent.
摘要:
A passivating agent is added to a cracking catalyst which has not been previously treated with the passivating agent by mixing the untreated cracking catalyst with a refractory material which has been previously treated with a passivating agent. At least a portion of the passivating agent is transferred by inter-particle transfer from the treated refractory material to the untreated cracking catalyst.A passivating agent may also be recovered from a previously treated cracking catalyst which has become contaminated by contacting the contaminated cracking catalyst with a refractory material which has not previously been treated with the passivating agent. At least a portion of the passivating agent will transfer by inter-particle transfer from the contaminated catalyst to the refractory material while the contaminants on the contaminated cracking catalyst will not transfer.
摘要:
An isomerization of a haloalkene is conducted in the presence of a mixture of a copper compound and a trithiocarbonic acid derivative or dithiocarbonic acid derivative.
摘要:
In an ore flotation process for recovering copper values from an aqueous slurry the improvement comprises a depressant composition of an amino-substituted carboxylic acid derivative or a mercapto-substituted carboxylic acid derivative in combination with a thiocarbonate derivative.