Pretreatment system for butter in waste alkali
By designing a pretreatment system for grease in waste alkali and utilizing gasoline extraction and static separation technologies, the problem of separating grease from waste alkali was solved, achieving long-term stable operation of the equipment and effective utilization of resources.
Patent Information
- Application Number
- CN202520390643.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-07
- Publication Date
- 2026-01-16
- Estimated Expiration
- 2035-03-07
AI Technical Summary
In ethylene plants, the grease in waste alkali is difficult to separate stably from the alkali solution, leading to a decrease in the efficiency of the alkali washing tower and an increase in the tower pressure differential, which affects the long-term stable operation of the plant.
Design a pretreatment system for grease in waste alkali, including components such as a gasoline mixer, a waste alkali-grease oil phase separator, baffles, and an oil phase separator. Through gasoline extraction and static separation technology, the waste alkali and grease are effectively separated.
Ensure that the oil content sent to the waste alkali oxidation unit is less than 100 ppm, and reduce the alkali concentration of the butter to 0.1%, so that it can be used as fuel for the incinerator, reduce hazardous waste treatment costs and generate steam as a by-product, and achieve fully automatic control.
Smart Images
Figure CN223800106U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to chemical technology field, specifically a kind of pretreatment system of butter in waste alkali. BACKGROUND
[0002] In the production process of chemical enterprise, it is crucial to ensure that the device runs smoothly, the equipment is in a safe state and the product quality is qualified, and the first task to achieve these goals is to properly handle the raw materials. Among them, the removal of acidic gases in raw materials occupies a key proportion. Especially in today's era, the construction of ethylene devices worldwide shows a trend of increasing number and increasing scale, which makes the removal of acidic gases such as carbon dioxide and hydrogen sulfide in cracking gas particularly critical.
[0003] According to the principle of butter formation, a large amount of butter will be produced in the process of using lye to remove acidic gases in ethylene device. Because the composition of this part of butter is extremely complex, its density is also unstable, so it is difficult to form a stable interface with lye. This condition directly causes the waste alkali oxidation unit of the device to malfunction, because the waste alkali oxidation unit has strict requirements for the oil content in waste alkali, which is less than 100 ppm. If the butter stays in the caustic washing tower for a long time without being removed, it will cause a series of serious problems, such as significant decrease in caustic washing efficiency of caustic washing tower, rapid rise of tower pressure difference, substandard removal of cracking gas acidic gases, and thus the whole device cannot realize long-period stable operation.
[0004] Therefore, it is of great practical significance to explore a way to effectively separate waste alkali and butter, and the operation method is simple and feasible. INVENTION CONTENTS
[0005] To solve the problems raised in the background art, the utility model provides a pretreatment system of butter in waste alkali, which solves the problem of substandard removal of cracking gas acidic gases, and thus enables the whole device to operate stably for a long period.
[0006] A pretreatment system of butter in waste alkali, comprising a gasoline mixer, a waste alkali butter oil phase separator, a baffle plate one, a partition one, a partition two, a washing water mixer, an oil phase separator, a baffle plate two, a partition three, a partition four and a pressure controller, characterized in that: the waste alkali solution pipeline and the gasoline pipeline are communicated with the gasoline mixer respectively, the gasoline mixer is communicated with the waste alkali butter oil phase separator through a pipeline, the waste alkali butter oil phase separator, the oil phase separator and the washing water mixer are communicated with each other through a pipeline, the waste alkali butter oil phase separator is communicated with the washing water mixer through a pipeline between the bottom of the waste alkali butter oil phase separator and the bottom of the washing water mixer, the waste alkali butter oil phase separator is provided with the baffle plate one, the partition one and the partition two, a defoamer is arranged at the top of the waste alkali butter oil phase separator, and the oil phase separator is provided with the baffle plate two, the partition three and the partition four.
[0007] Preferably, a flow controller one is arranged on the waste alkali solution pipeline, a flow controller two and a control valve one are arranged on the gasoline pipeline, and the flow controller one is connected with the flow controller two and the ratio controller one.
[0008] Preferably, double-end through pipes are arranged at the bottom of the waste alkali butter oil phase separator and the bottom of the oil phase separator.
[0009] Preferably, a flow controller three and an adjusting valve one are arranged on the pipeline communicated with the waste alkali butter oil phase separator and the washing water mixer from left to right, a washing water pipeline is arranged on the washing water pipeline, a flow controller four and a washing water adjusting valve are arranged on the washing water pipeline, and the flow controller three and the flow controller four are connected and communicated with the ratio controller two.
[0010] Preferably, adjusting valves two and three and a waste liquid waste alkali oxidation unit pipeline are arranged on the pipeline communicated between the bottom of the waste alkali butter oil phase separator and the bottom of the oil phase separator, liquid level controllers are arranged on the waste alkali butter oil phase separator and the oil phase separator, a gasoline storage tank pipeline is arranged at the bottom of the oil phase separator, and a pipeline valve is arranged on the gasoline storage tank pipeline.
[0011] Preferably, nitrogen sealing flare pipelines are arranged at the bottom of the waste alkali butter oil phase separator and the oil phase separator. Compared with the prior art, the utility model has the beneficial effects as follows:
[0012] The utility model ensures that the oil content sent to the waste alkali oxidation unit is less than 100ppm, the alkali concentration of the separated butter is 0.1% (mass fraction) and can be used as fuel of a waste liquid incinerator, reduces the hazardous waste treatment cost and can by-product part of steam, and the whole process can realize full-automatic control. BRIEF DESCRIPTION OF DRAWINGS
[0013] Figure 1 It is a whole system schematic view of the utility model. DETAILED DESCRIPTION
[0014] The technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.
[0015] In one embodiment, a pretreatment system of butter in waste caustic, comprising a gasoline mixer 5, a waste caustic butter oil phase separator 6, a baffle plate one 7, a partition one 8, a partition two 9, a washing water mixer 20, an oil phase separator 21, a baffle plate two 22, a partition three 23, a partition four 24 and a pressure controller 33, characterized in that: a waste caustic solution pipeline 1 and a gasoline pipeline 3 are communicated with the gasoline mixer 5 respectively, the waste caustic solution pipeline 1 is provided with a flow controller one 1.1, the gasoline pipeline 3 is provided with a flow controller two 3.1 and a control valve one 3.2, a ratio controller one 2 is connected between the flow controller one 1.1 and the flow controller two 3.1, the gasoline mixer 5 is communicated with the waste caustic butter oil phase separator 6 through a pipeline, the waste caustic butter oil phase separator 6, the oil phase separator 21 and the washing water mixer 20 are communicated through a pipeline, the bottom of the waste caustic butter oil phase separator 6 and the bottom of the washing water mixer 20 are communicated through a pipeline, the waste caustic butter oil phase separator 6 is provided with the baffle plate one 7, the partition one 8 and the partition two 9, a defoamer 10 is arranged at the top of the waste caustic butter oil phase separator 6, and the oil phase separator 21 is provided with the baffle plate two 22, the partition three 23 and the partition four 24.
[0016] In one embodiment, the bottom of the waste caustic butter oil phase separator 6 and the bottom of the oil phase separator 21 are provided with double-head pipes 125, the pipeline communicated between the waste caustic butter oil phase separator 6 and the washing water mixer 20 is sequentially provided with a flow controller three 6.1 from left to right, and a washing water pipeline 17 is provided with an adjusting valve one 6.2, the washing water pipeline 17 is provided with a flow controller four 17.1 and a washing water adjusting valve 17.2, and a ratio controller two 16 is connected and communicated between the flow controller three 6.1 and the flow controller four 17.1.
[0017] In one embodiment, the pipeline communicated between the bottom of the waste caustic butter oil phase separator 6 and the bottom of the oil phase separator 21 is provided with an adjusting valve two 6.3, an adjusting valve three 6.4 and a waste liquid waste caustic oxidation unit pipeline 27, the waste caustic butter oil phase separator 6 and the oil phase separator 21 are provided with liquid level controllers 26, the bottom of the oil phase separator 21 is provided with a gasoline to tank pipeline 28, the gasoline to tank pipeline 28 is provided with a pipeline valve 28.1, and the bottom of the waste caustic butter oil phase separator 6 and the oil phase separator 21 are provided with nitrogen seal to flare pipeline 31.
[0018] The oil-containing waste lye from the caustic washing tower and gasoline from the storage tank are mixed in the gasoline mixer 5 and then enter the waste lye oil phase separator 6. The waste lye oil phase separator 6 is designed with a first chamber, a second chamber and a third chamber, and the three chambers are separated by the baffle 1 8 and the baffle 2 9, both of which are designed to be not sealed at the top. When the oil-containing waste lye from the caustic washing tower and the gasoline from the storage tank are mixed in the gasoline mixer 5, the gasoline will extract the yellow oil in the waste lye, and the two will be quickly separated into layers due to the density difference. The lye is heavier and sinks to the bottom, and the gasoline is lighter and floats on the top. The waste lye oil phase separator 6 is designed with a baffle 1 7 in the leftmost first chamber to further promote the mixing of the oil-containing waste lye and the gasoline. The feed line of the waste lye oil phase separator 6 is designed to the left of the first chamber to prevent the feed from affecting the static separation process in the first chamber. As the layers are separated, more and more oil is formed in the first chamber, and eventually it flows over the top of the baffle into the second chamber. The lye at the bottom of the first chamber directly enters the third chamber through the double-head pipe 1 25 at the bottom of the oil phase separator 21.
[0019] The oil phase separator 21 is designed similarly to the waste lye oil phase separator 6, with three chambers separated by the baffle 3 23 and the baffle 4 24, both of which are designed to be not sealed at the top. The oil phase from the second chamber of the waste lye oil phase separator 6 is mixed with the washing water in the washing water mixer 20 to wash away the residual lye in the oil phase. Due to the density difference, the oil phase is lighter and floats on the top in the first chamber of the oil phase separator 21, and the washing water is heavier and sinks to the bottom. Similarly, the leftmost chamber of the oil phase separator 21 is designed with a baffle 2 22 to further promote the mixing of the oil phase and the washing water. The outlet of the feed line is designed to be towards the left to prevent the feed from affecting the static separation process in the first chamber. As the layers are separated, more and more oil is formed in the first chamber, and eventually it flows over the top of the baffle into the second chamber. The washing water at the bottom of the first chamber, which is mixed with the lye, directly enters the third chamber through the double-head pipe 1 25 at the bottom of the oil phase separator 21. The oil in the second chamber is further separated and is sent out under the action of the liquid level controller 26.
[0020] The lye in the third chambers of the waste lye oil phase separator 6 and the oil phase separator 21 is sent out under the action of the respective liquid level controllers 26 and then combined and sent to the downstream waste lye oxidation unit for treatment.
[0021] The waste lye butter oil phase separator 6 and the oil phase separator 21 are provided with a nitrogen seal flare line 31 control, under the control of the nitrogen seal flare line 31, a certain pressure is maintained, when the pressure is high, the flare regulating valve is automatically opened to release pressure, when the pressure is low, the nitrogen regulating supplement valve is automatically opened to supplement nitrogen to supplement pressure.
[0022] The mixed waste lye and gasoline is adjusted by the ratio controller 2, when the oil-containing waste lye flow from the lye washing tower is detected, the ratio controller 2 automatically opens the control valve 3.2 to supplement a certain amount of gasoline according to the set ratio value.
[0023] After the oil in the second chamber of the waste lye butter oil phase separator 6 is sent out, the washing water regulating valve 17.2 is automatically opened under the action of the ratio controller 2 to supplement a certain amount of washing water according to the set ratio value.
[0024] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and modifications can be made to these embodiments without departing from the principles and spirits of the present application, the scope of the present application is defined by the appended claims and their equivalents.
Claims
1. A system for the pretreatment of grease in spent caustic comprising a gasoline mixer (5), a spent caustic grease oil phase separator (6), a baffle plate one (7), a partition one (8), a partition two (9), a wash water mixer (20), an oil phase separator (21), a baffle plate two (22), a partition three (23), a partition four (24), and a pressure controller (33), characterized in that: The waste alkali solution pipeline (1) and the gasoline pipeline (3) are communicated with the gasoline mixer (5) respectively, the gasoline mixer (5) is communicated with the waste alkali butter oil phase separator (6) through a pipeline, the waste alkali butter oil phase separator (6), the oil phase separator (21) and the washing water mixer (20) are communicated through a pipeline, the waste alkali butter oil phase separator (6) bottom and the washing water mixer (20) bottom are communicated through a pipeline, the waste alkali butter oil phase separator (6) is provided with baffle one (7), baffle one (8) and baffle two (9), the waste alkali butter oil phase separator (6) is provided with defoamer (10) at the top, the oil phase separator (21) is provided with baffle two (22), baffle three (23) and baffle four (24) inside.
2. A system for the pre-treatment of butter in spent caustic according to claim 1, characterized in that: The flow controller one (1.1) is arranged on the waste alkali solution pipeline (1), the flow controller two (3.1) and the control valve one (3.2) are arranged on the gasoline pipeline (3), the flow controller one (1.1) and the flow controller two (3.1) are connected with the ratio controller one (2).
3. A system for the pre-treatment of butter in spent caustic according to claim 1, characterized in that: The waste alkali butter oil phase separator (6) bottom and the oil phase separator (21) bottom are provided with double-head through pipes (125).
4. A system for the pre-treatment of butter in waste caustic according to claim 1, characterized in that: The pipeline communicated between the waste alkali butter oil phase separator (6) and the washing water mixer (20) is sequentially provided with the flow controller three (6.1) and the adjusting valve one (6.2) from left to right, the washing water pipeline (17) is arranged on the adjusting valve one (6.2), the flow controller four (17.1) and the washing water adjusting valve (17.2) are arranged on the washing water pipeline (17), the flow controller three (6.1) and the flow controller four (17.1) are communicated to set the ratio controller two (16).
5. A system for the pretreatment of butter in waste caustic according to claim 1, characterized in that: The adjusting valve two (6.3), the adjusting valve three (6.4) and the waste liquid waste alkali oxidation unit pipeline (27) are arranged on the pipeline communicated between the waste alkali butter oil phase separator (6) bottom and the oil phase separator (21) bottom, the liquid level controller (26) is arranged on the waste alkali butter oil phase separator (6) and the oil phase separator (21), the gasoline storage tank pipeline (28) is arranged at the bottom of the oil phase separator (21), the pipeline valve (28.1) is arranged on the gasoline storage tank pipeline (28).
6. A system for the pre-treatment of butter in spent lye according to claim 1, characterized in that: The nitrogen sealing flare pipeline (31) is arranged on the waste alkali butter oil phase separator (6) bottom and the oil phase separator (21).