In the manufacture of aniline, the condensed reactor products are separated in a

Question

In the manufacture of aniline, the condensed reactor products are separated in a decanter. The decanter separates the feed into an organic phase and an aqueous phase. Most of the aniline in the feed is contained in the organic phase and most of the water in the aqueous phase. Using the data given below, calculate the stream compositions. Data: Typical feed composition, including impurities and by-products, weight %: water 23.8, aniline 72.2, nitrobenzene 3.2, cyclo-hexylamine 0.8. Density of aqueous layer 0.995, density of organic layer 1.006. Therefore, the organic layer will be at the bottom. Solubility of aniline in water 3.2 % w/w, and water in aniline 5.15% w/w. 2 Partition coefficient of nitrobenzene between the aqueous and organic phases: Corganic/Cwater = 300 Solubility of cyclo-hexylamine in the water phase 0.12% w/w and in the organic phase 1.0% w/w. In the manufacture of aniline, the condensed reactor products are separated in a decanter. The decanter separates the feed into an organic phase and an aqueous phase. Most of the aniline in the feed is contained in the organic phase and most of the water in the aqueous phase. Using the data given below, calculate the stream compositions. Data: Typical feed composition, including impurities and by-products, weight %: water 23.8, aniline 72.2, nitrobenzene 3.2, cyclo-hexylamine 0.8. Density of aqueous layer 0.995, density of organic layer 1.006. Therefore, the organic layer will be at the bottom. Solubility of aniline in water 3.2 % w/w, and water in aniline 5.15% w/w. 2 Partition coefficient of nitrobenzene between the aqueous and organic phases: Corganic/Cwater = 300 Solubility of cyclo-hexylamine in the water phase 0.12% w/w and in the organic phase 1.0% w/w. In the manufacture of aniline, the condensed reactor products are separated in a decanter. The decanter separates the feed into an organic phase and an aqueous phase. Most of the aniline in the feed is contained in the organic phase and most of the water in the aqueous phase. Using the data given below, calculate the stream compositions. Data: Typical feed composition, including impurities and by-products, weight %: water 23.8, aniline 72.2, nitrobenzene 3.2, cyclo-hexylamine 0.8. Density of aqueous layer 0.995, density of organic layer 1.006. Therefore, the organic layer will be at the bottom. Solubility of aniline in water 3.2 % w/w, and water in aniline 5.15% w/w. 2 Partition coefficient of nitrobenzene between the aqueous and organic phases: Corganic/Cwater = 300 Solubility of cyclo-hexylamine in the water phase 0.12% w/w and in the organic phase 1.0% w/w.

Explanation / Answer

As all concentrations are given in weight % and w/w,so we assume that total weight of the feed be 100g.

So, as per the data given,

Solubility of water in aniline= 5.15%w/w

Solubility of aniline in water= 3.2%w/w

Solubility of cyclohexylamine in aq. phase= 0.12%w/w

Solubility of cyclohexylamine in org. phase= 1.0%w/w

Aqueous phase:

23.8g water= (23.8g/18g/mol)=1.32 mol

Now, 5.15g aniline is soluble in 94.85g of water. So,

(5.15/94.85)x23.8= 1.292g= (1.292/93.13)=0.014mol of aniline present in aq. phase.

0.12g of cyclohexylamine is present in 99.88g water.So,

(0.12/99.88)x23.8=0.03g=0.03/99.17= 3.02x10-4 mol cyclohexylamine is present in aq. phase.

organic phase:

72.2g aniline= (72.2/93.13)=0.78 mol aniline

3.2g water is soluble in 96.8g aniline. So,

(3.2/96.8)x72.2=2.3g= 0.133mol water in org. phase

1.00g of cyclohexylamine is present in 99.00g water.So,

(1/99)x72.2= 0.73g +0.8g(already present)= 1.53g =0.015 mol cyclohexylamine in org. phase

3.2g= (3.2/123.06)=0.03mol nitrobenzene in org. phase.

So, composition:

Aqueous phase:

1.32 mol water + 0.014mol aniline + 3.02x10-4 mol cyclohexylamine.

organic phase:

0.78mol aniline + 0.133mol water + 0.015mol cyclohexylamine + 0.03mol nitrobenzene

COMPONENT WEIGHT % Water 23.8 Aniline 72.2 Nitrobenzene 3.2 Cyclohexylamine 0.8

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