Good day,

I am carrying out a design project in simulating the hydrotreating process of diesel using HYSYS. The problem that I faced is that there is no fluid package that can fully defined the composition of the sulfur and nitrogen compound in term of the Binary Coefficient and was assumed to be zero by HYSYS.

My sulfur compounds are benzothiophene, dibenzothiophene and pentylsulphide and the nitrogen compound is quinoline.

Is it safe to proceed with the design with these binary coefficients assumed to be zero?

Thank you.

Regards,
Doug

Hi,

Typically in HDS units the Feed sulphur is spread over all components and so is the nitrogen. I have not seen any components split other than light mercaptans and H2S that can be used in a simulaiton model.

The feed diesel stream should be input as distillation (D86 ..etc) gravity , notrogen (total/curve) and sulphur (total and curve), then you make some sort of conversion / relationship with pressure/ temp. a yeild shift reaction can be used in Hysys.

The distillation data is converted into hypos and not real components , so dont expect parameter here.

Petro-sim, the KBC version of hysys has this HDS unit built in also the new hysys with HDS UOP model. look at those

You need to establish what your objectives are, is it to model few components or general sulphur removal from Diesel HDS.

cheers,

SM