초록 ▼

The present invention relates to a process for treating secondary components obtained in acrolein and/or (meth)acrylic acid production, comprising the steps of: a) contacting at least one wastewater stream (201) comprising at least a portion of the water of reaction removed in a first stage of a sat

The present invention relates to a process for treating secondary components obtained in acrolein and/or (meth)acrylic acid production, comprising the steps of: a) contacting at least one wastewater stream (201) comprising at least a portion of the water of reaction removed in a first stage of a saturation column (101) with at least one process offgas stream (203),b) introducing energy by means of a first heat transferer (103) provided in a first saturation circuit (301) into the first stage of the saturation column (101),c) partly vaporizing the wastewater stream (201) into the process offgas stream (203) and passing the combined gas stream (205) into a second stage of the saturation column (101),d) drawing off a concentrated wastewater stream (207) from the bottom (1011) of the first stage of the saturation column (101) and feeding it to the top (1023) of the second stage of the saturation column (101),e) introducing energy by means of a second heat transferer (105) provided in a second circuit (303) into the second stage of the saturation column (101),f) partly vaporizing the concentrated wastewater stream (207) into the combined gas stream (205) to obtain an offgas stream (209),g) superheating the offgas stream (209), after it has been saturated, in a third heat transferer (113) to obtain a superheated offgas stream (211) andh) transferring the offgas stream (209) or the superheated offgas stream (211) from the saturation column (101) to a thermal aftertreatment. The present invention further relates to a plant (1) for treating the secondary components obtained in acrolein and/or (meth)acrylic acid production.

대표청구항 ▼

1. A process for treating secondary components obtained in acrolein or (meth)acrylic acid production, the process comprising: a) contacting at least one acid water stream comprising at least a portion of water removed in a first stage of a saturation column with at least one process offgas stream;b)

1. A process for treating secondary components obtained in acrolein or (meth)acrylic acid production, the process comprising: a) contacting at least one acid water stream comprising at least a portion of water removed in a first stage of a saturation column with at least one process offgas stream;b) introducing energy with a first heat transferer provided in a first saturation circuit into the first stage of the saturation column;c) partly vaporizing the acid water stream into the process offgas stream to obtain a combined gas stream and passing the combined gas stream into a second stage of the saturation column;d) drawing off a concentrated acid water stream from the bottom of the first stage of the saturation column and feeding it to the top of the second stage of the saturation column;e) introducing energy with a second heat transferer provided in a second circuit into the second stage of the saturation column;f) partly vaporizing the concentrated acid water stream into the combined gas stream to obtain an offgas stream;g) superheating the offgas stream, after it has been saturated, in a third heat transferer to obtain a superheated offgas stream; andh) transferring the offgas stream or the superheated offgas stream from the saturation column to a thermal aftertreatment. 2. The process according to claim 1, wherein energy is introduced in step b) by coupling the first heat transferer with a stream present in the process for acrolein or (meth)acrylic acid production. 3. The process according to claim 2, wherein the stream present in the process for acrolein or (meth)acrylic acid production is an acid water circulation stream from an absorption column. 4. The process according to claim 2, wherein the stream present in the process for acrolein or (meth)acrylic acid production is a circulation stream from a condensation circuit of a distillation column. 5. The process according to claim 1, wherein energy is introduced in step e) by coupling the second heat transferer with a heating medium stream. 6. The process according to claim 1, wherein, in step c), at least 20% of the wastewater stream is vaporized.