US 2019/0375992 A1 · STEAM QUENCH PERFORMANCE IMPROVEMENT

Abstract

Methods that reduce fouling of equipment in a quench water recycling loop of a steam cracker quench system by separating tar from water in the quench water recycling loop. The methods may include settling a bottom stream comprising pyrolysis gasoline, from a quench tower, in at least two quench water settlers in parallel, each of the quench water settlers producing a settler hydrocarbon stream and a settler bottom quench water stream. The methods may also include mixing a bottom stream comprising pyrolysis gasoline, from a quench tower, with quench tower effluent water to form a combined stream. The method may further include settling the combined stream in at least two quench water settlers in parallel to produce settler hydrocarbon streams, settler bottom quench water streams, and settler process water streams.

Claims20

Dependent claims

A method of reducing fouling of equipment in a quench water recycling loop of a steam cracker quench system by separating tar from water in the quench water recycling loop, the method comprising:

receiving furnace effluent in a quench tower;
quenching the furnace effluent in the quench tower with quench water to produce (1) a bottom stream comprising pyrolysis gasoline, (2) quench tower effluent water, and (3) a gas stream;
settling the bottom stream comprising pyrolysis gasoline in at least two quench water settlers in parallel, each of the quench water settlers producing a settler hydrocarbon stream and a settler bottom quench water stream;
and
feeding the quench tower effluent water to a water stripper for separation into a stripper hydrocarbon stream, a stripper water stream, and a tar/oil stream;
and
recirculating the settler bottom quench water streams and the stripper water stream to the quench tower.

4 more elements

A method of reducing fouling of equipment in a quench water recycling loop of a steam cracker quench system by separating tar from water in the quench water recycling loop, the method comprising:

receiving furnace effluent in a quench tower;
quenching the furnace effluent in the quench tower with quench water to produce (1) a bottom stream comprising pyrolysis gasoline, (2) quench tower effluent water, and (3) a gas stream;
mixing the bottom stream comprising pyrolysis gasoline and the quench tower effluent water to form a combined stream;
settling the combined stream in at least two quench water settlers in parallel to produce settler hydrocarbon streams, settler bottom quench water streams, settler process water streams, and tar/oil streams;
and recirculating the settler bottom quench water streams to the quench tower.

2 more elements

Dependencies are inferred from the claim text.

Steam quench performance improvement

Life of this patent

Steam quench performance improvement

Life of this patent

Abstract

Claims20