An existing plant is treating $100$MMSCFD of inlet gas of the composition as given

in below table. A conventional MEA amine system has been used to treat the gas

$(3$ moles of MEA per mole of acid gas with a $20\%$ solution of MEA in water$).$ The

Sales gas had only to meet Trans Canada specification for H$2$S content.

A field is discovered nearby that has gas of the composition given by in below

table. The maximum flow of raw gas from this field is $40$ MMSCFD$.$

It has been proposed that instead of building a new sweetening plant that the gas

be brought into the present plant and the sweetening solution changed to DEA

amine. The licensor of the SNPA processes recommend that the maximum

solution rates and strength of the patent be sued. Also, that the loading of each

gas in amine be the minimum but still in the patent range.

Determine whether the existing plant can handle the total raw gas as now

contemplated.

a$)$ The amine contactor, exchangers and pumps are sized by liquid loading.

b$)$ The amine still and its equipment are sized from steam required for

regeneration.

c$)$ Comment on the result of your investigation

Compound Mol$\%$

H$2$S $3\mathrm{.}5$

CO$25\mathrm{.}5$

C$179\mathrm{.}8$

C$25\mathrm{.}2$

C$32\mathrm{.}4$

IC$40\mathrm{.}8$

nC$41\mathrm{.}3$

C$5+1\mathrm{.}5$

ENCH $609/$Assignment #$04$ Page $2$ of $2$ February $20,2024$

Due date: February $27,2024$

The SNPA$-$DEA patent $($Canadian patent $651,379)$ covers the range of $0\mathrm{.}9$ moles

to $1\mathrm{.}3$ moles of amine per mole of acid gas. Assumed the design of the amine

contactor and amine still are the same as for MEA. You can consider twenty to

thirty weight percent of DEA is used. The design steam rate is $1\mathrm{.}2$ lbs$/$gallons of

circulation.

Existing Field New Field

Flow $100$ MMSCFD $40$ MMSCFD

Compound Mol$\%($dry base$)$ Mol$\%($dry base$)$

H$2$S $6\mathrm{.}015\mathrm{.}0$

CO$21\mathrm{.}01\mathrm{.}0$

C$182\mathrm{.}081\mathrm{.}0$

C$25\mathrm{.}02\mathrm{.}0$

C$31\mathrm{.}71\mathrm{.}0$

IC$40\mathrm{.}8-$

nC$41\mathrm{.}5-$

C$5+2\mathrm{.}0-$