SA516380397B1 - Separation of Crude Acetonitrile From Acrylonitrile - Google Patents

Abstract

An apparatus comprises a column comprising a top, middle and bottom sections. The middle section is configured to receive a first stream comprising acrylonitrile, HCN, acetonitrile, and water. The column is configured to distill the first stream, and produce from the first stream a second stream, the second stream comprising water that is substantially free of acetonitrile. The column is configured to produce a third stream in the top section of the column, the third stream comprising acrylonitrile, HCN, and a portion of the water from the first stream. The column comprises a crude acetonitrile concentration zone defined by a baffle and an interior facing wall of the column. The column is configured to produce in an upper volume of the zone a stream comprising water and acetonitrile that is substantially devoid of acrylonitrile and HCN. Fig 3.

Description

Separation of Crude Acetonitrile From Acrylonitrile FULL DESCRIPTION BACKGROUND The invention relates to an improved equipment and process for the manufacture of acrylonitrile and methacrylonitrile specifically. 5 The various processes and systems for the manufacture of acrylonitrile and methacrylonitrile are known; See 1 for example » US Patents Nos. 3,399,120; 3,442,771; 5,703,268; 0; and 6,107,509. Conventional processes provide for the separation of acrylonitrile from crude acetonitrile; Cua is a useful joint product. Conventional processes for separating acrylonitrile from crude acetonitrile typically involve the use of at least two column 0s - a first column and a second column. The first column, also referred to as an extraction column, is designed; To substantially separate acrylonitrile and hydrogen cyanide from acetonitrile .a conventional process for separating acrylonitrile from crude acetonitrile is illustrated in Figure 1. As shown in Figure 1; Feed stream 1 is sent from a sale acrylonitrile absorber (not shown) to the first column 10. Feed stream 1 typically contains acrylonitrile “hydrogen cyanide” acetonitrile and water. Water stream 2 largely devoid of acetonitrile is recycled from at or near the bottom of second column 20 to the o>upper portion of first column 10 Even the separation of acetonitrile from acrylonitrile and 0-hydrogen cyanide is assisted by extractive distillation. Stream 3 containing acrylonitrile is removed; hydrogen cyanide; and part of the water from feeding 1 from the top of the first column

top of first column 10. Liquid stream 4 containing water and acetonitrile is sent as feed from the bottom of first column 10 to second column 20. Vapor stream 5 is sent from second column 20 to column the first 10 to provide the required heat for distillation in the first column 10. The crude acetonitrile stream 6 containing acetonitrile is removed; Water and small amounts of acrylonitrile and hydrogen cyanide are removed from the top of the second column 20. The residual water stream 7© that is largely free of acrylonitrile” is not recycled; acetonitrile and for the water stream 2 returning to the first column 10; It is discharged from the second column 20 at or near the bottom of the second column 20. Another conventional process for separating acrylonitrile from crude acetonitrile is illustrated in Fig. 2. As shown in Fig. 2 a feed stream 101 is sent from an acrylonitrile absorbent ( not shown) to first column 110. Feed stream 101 typically contains acrylonitrile, hydrogen cyanide “acetonitrile” and water. Water stream 102 which is largely free of acetonitrile is recirculated from at or near the bottom of first column 110 to the top of first column 110 until the separation of the 5-acetonitrile from acrylonitrile, cyanide, is aided by extractive distillation. Part of the portion of stream 102 that is not cycled from bottom to dad of first column 110 is discharged from column 110 as stream 107. Stream 103 containing acrylonitrile is removed; hydrogen cyanide; eng of water from the feed stream 101 from the top of the first column 110. A side vapor stream 104 containing water and acetonitrile is sent from the first column 110 as feed to the second 0 column 120. The liquid stream 105 containing water and a small amount of acetonitrile is sent From second column 120 to first column 110 for additional scavenging of acetonitrile. The crude acetonitrile stream 106 containing acetonitrile is removed; water and small amounts of acrylonitrile and hydrogen cyanide from dad second column 120. Stream 108 is discharged; which represents water largely free of acrylonitrile; and hydrogen cyanide; and acetonitrile" from the bottom of the second column 120.

Conventional systems and methods that require two-column systems are expensive; And two-column systems take up a lot of plot space. Since there are two columns; Conventional equipment and methods require log compression; ule includes two sets of cag ll two sets of chassis; interlocking pipes between the two bowls or the two columns; And two pieces for bowls or poles. General Description of the Invention Accordingly » One of the features of the present disclosure is to provide a safe method; cost effective and advantageous; And equipment that overcomes or reduces the defects of traditional methods and equipment. in one of the features; Equipment is offered with column having upper section; Middle sector and lower sector. The middle section of the shaft is designed to receive a first stream; The first stream includes a feed stream; 0 The feed stream contains acrylonitrile; hydrogen cyanide « acetonitrile ; and water. The column is designed to distill the first stream and produce from the first stream a second stream; The second stream includes water which is largely free of acetonitrile. The shaft is designed to recycle the second stream from the lower section of the shaft to the upper section of the shaft. The shaft is designed to produce a third current in the upper section of the single shaft; The third stream contains 5 acrylonitrile; hydrogen cyanide ¢ing from the water from the first stream. The column includes a crude acetonitrile concentration zone defined by a beam; The raw acetonitrile concentration region is in the middle sector of the column. The raw acetonitrile concentration zone includes an upper compartment and a lower compartment. The column is designed to produce in the upper part of the raw acetonitrile concentration region a steam stream lan that includes water and acetonitrile and is largely devoid of acrylonitrile and hydrogen cyanide. The concentration area of 0 crude acetonitrile includes an upper outlet in the upper compartment; The upper outlet shall be designed to allow a vapor stream comprising water and acetonitrile largely free of acrylonitrile and hydrogen cyanide to flow out of the column. In the “gal” feature, the process for separating acetonitrile from acrylonitrile includes a first stream supply comprising acrylonitrile hydrogen cyanide; acetonitrile and water to a column; Distillation of the first stream in the column to produce

a second stream contains water and is largely free of acetonitrile; a third stream comprising acrylonitrile; hydrogen cyanide » and a fourth stream that includes water and acetonitrile and is largely free of acrylonitrile and hydrogen cyanide. in that feature; The fourth stream is about 5 to about 8 7 by weight acetonitrile. The above and other features, characteristics and advantages of the current disclosure will be evident from the detailed description of the models shown, which will be read in conjunction with the attached drawings. BRIEF EXPLANATION OF THE DRAWINGS A more comprehensive understanding of typical embodiments of the present invention and its features may be obtained by referring to the description al in view of the accompanying drawings; for which like numbers denote similar features ly 0 have: Figure 1 is a schematic flowchart of a conventional equipment; Figure 2 is a schematic flowchart of another conventional equipment; Figure 3 is a schematic flowchart of a model according to at least one of the detection attributes; Figure 4 shows a flowchart of the method according to the detection attributes. 5 Detailed Description: The process and equipment of the present disclosure are described in detail with reference to Figure 3. The Apparatus 300 equipment may be offered for the separation of acrylonitrile from crude acetonitrile. As shown in Figure 3; Feed stream 301 is sent from sale acrylonitrile absorbent (not shown) to first column 310. Feed stream 301 typically contains acrylonitrile “0” cyanide; acetonitrile; and water. Feedstream 301 can be the same or similar to Feedstream 1 shown in Figure 1 and/or Feedstream 101 shown in Figure 2.

in one of the features; The 300 has a single column 310. The single column 310 has a top section 330” and a middle section 340” and a bottom section 350. Middle section 340 can be designed From monocoque 310 to receive first stream or feed stream 301 first stream 301 comprises acrylonitrile, hydrogen cyanide, acetonitrile and water. First stream 301 can be a stream of sale acrylonitrile adsorption (not shown). The first stream can be 301 is the same or similar to feed stream 1 shown in Figure 1 and/or feed stream 101 shown in Figure 2. A single column 310 is designed to distill the first stream 301 and produce from the first stream 301 a second stream 0 302. The stream may include ii 302 on water that is largely free of acetonitrile.As used here the term largely free of acetonitrile refers to a stream having a 7 wt percentage of acetonitrile about 1 or “Jd in another aspect; about 0.00005 less ¢ and in one aspect other;about 0.00004 or less.Single shaft 310 can be designed to recycle the Recycle second stream 302 from bottom section 350 to top section 5 330 with single shaft 310. Stream 302 can exit from bottom section 350 through bottom outlet 410 as shown in Figure 3; or outlet near lower sector 350. Uncirculated stream 302 ed may be discharged from lower sector 350 to upper sector 0 of column 310 as stream 307. Stream 307 may include water that is substantially acrylonitrile-free acrylonitrile and hydrogen cyanide « 0 acetonitrile 80810010116. In a feature; The shaft has an upper section and a middle section and the ratio of the diameter of the middle section to the upper section is about 1.5 to Joa 2.5; in the coal trait is about 5 to about 2.25; In another aspect »about 1.8 to about 2. A single shaft 0 may be designed to produce the 3rd stream 303 in the upper sector 330. The 3rd stream 303 may include an acrylonitrile»; hydrogen cyanide; and a water fraction from the first stream 5 301. A single column 310 may include a crude acetonitrile concentration region

2 Defined by baffle 344 and interior facing wall 346 in middle section 340. Crude acetonitrile concentrating area 342 can be located in midsection 340 with single column 310. Crude acetonitrile concentrating area 342 can have upper space volume 348 and lower compartment 352. The crude acetonitrile concentration region 342 can be designed to produce in the upper compartment 348 a fourth stream 354. The fourth stream 354 can be a vapor stream that includes water and acetonitrile that is largely free of acrylonitrile and cyanide 0 as used herein largely free of acrylonitrile refers to a stream having a 7 by weight acrylonitrile content of about 0.02 or less” in the coal of about 0.01 7 by weight or less” in another aspect; about 0.005 7 by weight or less” and in another aspect; Approximately 0.001 #7 by weight or less. as

0 User cla The expression substantially cyanide-free refers to a stream with a 7-by-weight cyanide of about 0.25 or less “in another aspect”; about 0.2 7 wt. or less” and in another aspect” about 0.1 7 wt. or less. In another feature; In the fourth stream it is about 5 to about 18 7 wt. acetonitrile »in another aspect » about 5 to about 15 7 wt » and in another aspect » about 8 to about 12 72 wt.

5 Crude acetonitrile concentration area 342 includes an upper outlet 356. Shall 356 can be designed to allow fourth stream 354 to flow out of upper compartment 348 in crude acetonitrile concentration area 342. Fourth stream 354 can flow out of single shaft 310 through conduit or line 358; which is in contact with the fluid with an overhead outlet 356. The fourth stream 4 may flow to the heat exchanger 360 where steam is condensed in the fourth stream 354

0 to dil and then exits heat exchanger 360 through conduit or line 362 in the form of fifth stream 366. Part of the stream 366 can be recycled back to single shaft 0 by means of stall or line 364. In that cand) about 6 to about 12 by weight is transferred from the fourth stream to the acetonitrile splitter after further processing; In another feature; About 7 to about 11 7 wt can be sent and in the cial attribute about 8 to about 10 7 wt. the current

5 366 via sud) or line 368 to equipment (not shown) for further processing; for example

Jbl separated the acetonitrile from the other components in the stream 366; Jie water. The fifth stream is about 35 to about 7 78 wt. acetonitrile" in the coal aspect about 35 to about 7 65 wt" in another aspect"; about 40 to about 7 60 wt.” By the cal attribute is about 45 to about 2 55 wt.

In one embodiment the area of concentration of crude acetonitrile 342 may comprise a set of plates extending between the beam 344 and an inward-oriented wall 346; With bottom tray 370 at bottom compartment 352, top tray 372 at top compartment 348 and additional trays (not shown) between bottom tray 370 and top tray 372. The total number of trays in the raw acetonitrile concentration area can be 342 about 5 to about 40 dishes; And in a feature

0 other; About 10 to about 20 dishes. in one of the models; The number of plates in the concentration area of crude acetonitrile 342 can be fifteen plates; The upper deck 372 is the fifteenth. Line 364 could be in fluid contact with inlet 374 in crude acetonitrile concentration region 342. Inlet 374 could be above top plate 372 in crude acetonitrile concentration region 2. Inlet 374 could be below outlet 356 in upper compartment 348.

5. Detected; unexpectedly; that both acrylonitrile and acetonitrile sufficiently extracted das can be obtained in a single column according to the model shown in Fig. 3. According to the disclosure; The required second column can be removed in stomach and traditional ways; Such as the second column 20 shown in Figure 1; and column 120 shown in Figure 3. With the removal of the need for a second column; There is no need for a feed line to a second shaft; Such as the conduit or line for the stream 4 shown in Figure 1 or the conduit or line for the side stream

0 104 shown in Figure 2; or the need for associated flow controllers or valves. The crude acetonitrile concentration area 342 can have a bottom outlet 376 in fluid contact with the conduit or line 378. The bottom outlet 376 can be located in a location that allows substantially all liquid to be removed from plate 370 from monocolumn 310. For example (Jl) can Placement of outlet 376 at a sealing trough 383 connected to the bottom of dish 370. Downstreams 380 can exit from a concentrating area

5 Crude acetonitrile 342 from monocolumn 310 through outlet 376 and then flow through the line

8 for further processing and/or storage. sell) current 382; which can be all current 0 or part of it; to column 310 via the conduit or line 384 which is in fluid contact with the inlet 386. Alternatively, downstreams 380 may be transported from the crude acetonitrile concentration area 342 to a desired location on column 310; For example; to dish 390 (shown in Figure 3) or dish 392 and remove lines 378 and 384; For example; If there is no need to send the 380 downstreams elsewhere. Column 310 can include a group of plates outside the concentration region of crude acetonitrile 342. As shown in Figure 3; (Sa) that the set of plates outside the concentration area of crude acetonitrile 342 includes plates 390 (388) 392 394; and 396. Plate 388 can be 0 bottom plate in lower sector 350. Plates 390 392 and 394 can be plates Intermediate in middle sector 340. Plate 396 can be a top plate in sector 0. Additional plates (not shown) can be fitted between plates 388 and 390; plates 392 and 394; and plates 394 and 396. Plates can extend beyond the concentration area of crude acetonitrile 342 through a complete horizontal cross-section of column 310; for example plates 388; 390; 392, of which 5 extends from side or inward wall 398 to side or inward wall 400; and plate 6 which extends from side or inward wall 402 to side or Inward-facing wall 4. The inward-facing wall 400 may include an inward-facing wall 346. Additional plates may extend beyond the crude acetonitrile concentration area 342 through a partial horizontal cross-section of column 310 eg plate 394 which extends through side 398 to beam 344. 0 could be the total number of dishes in the th Column 310 is outside the concentration area of crude acetonitrile 342 between eighty and one hundred dishes. in one of the models; The number of plates in column 310 could be outside the concentration region of crude acetonitrile 342 ninety plates. in one of the models; (Sa) dish 396 is the 90th dish in column 310 located outside the crude acetonitrile concentration zone 342. As shown in Fig. 3; in one pial the crude acetonitrile concentration zone includes 5 first sets of plates; the first group spans of plates between girder 344 and the guiding wall

For the first inside 346. The plates of the first set of plates are placed at different heights of the shaft; Each of the first set of dishes includes a horizontal plane extending across a cross-section of the crude acetonitrile concentration area 342. The crude acetonitrile concentration area 342 includes the lower plate 370 in the lower compartment 352) the upper plate 372 in the upper compartment 348; and at least one plate (not shown) between the lower plate and the upper plate in the area of raw acetonitrile concentration.As shown in Figure 3, a lower recycling loop can be equipped.The lower recycling loop can be designed to recycle at least part of a stream from the bottom outlet 376 in the raw acetonitrile concentration area 342 to the inlet Middle inlet 386 in middle section 340 of shaft 310 Middle inlet 386 placed below raw acetonitrile concentration area 342. At least 0 part of the lower recirculating ring may be placed outside the shaft. According to one of the features, the equipment jag apparatus 300 has the ability of Wl to sell recycle stream 380 to column 310 via line 384, and/or to draw current 0 through line 378 and send current 380 to a place AT at the acryloplonitre terminal to. As shown in Figure 3; The shaft can include a second set of plates; 5 The second set of plates are located outside the crude acetonitrile concentration area 342; Where the plates of the second set of plates are placed at different heights of the shaft; Each of the second group of plates includes a horizontal plane extending across a cross-section of the column. Those skilled in the field will realize that according to the disclosure; Dish 394 can be a Silas dish of Dish 372; where beam 344 extends through the plate; Instead of plate 394 Sle 0 on a separate plate from plate 372. In that embodiment chal) the dish has a portion outside the RA concentration area 342 sag separate into the RA concentration area 342. Can be in additional dishes In the middle section 340 gia outside the ore acetonitrile concentration region 342 and a separate part in the ore acetonitrile concentration region 342. In the Sa «AT model the beam 344 includes a series of beam pieces, where each beam piece extends between pairs of group plates The first of the dishes.

Stream 301 can enter column 310 through inlet 408. Inlet 408 can be located between plate 394 and the plate (not shown) above plate 394. Plate 394 can be between the 58th to 68th plate of lower sector 350. In one embodiment; Plate 394 is the 64th plate of lower sector 350.

The entry 386 of column 310 may be located between plate 370 and plate 390 in central sector 340. In one embodiment; dish 390 could be the 25th to 33rd dish of lower sector 350; And dish 392 could be the 26th to 34th dish of lower sector 350. In one embodiment; dish 0 is the 29th dish of lower sector 350; And dish 392 is the thirtieth dish

0 of lower sector 350. Inlet 406 of column 310 can be in fluid contact with stream 302. Inlet 6 can be located in upper sector 330 of column 310. Inlet 406 can be designed to receive stream 302 in column 310 above plate 396. Sa to be Stream 366 is a crude acetonitrile stream with acetonitrile and water and is largely free of acrylonitrile and hydrogen cyanide. The water representing ern of stream 301 which exits column 310 as stream 307 may be substantially free of acrylonitrile hydrogen cyanide; and acetonitrile. Stream 307 may be discharged at or near lower sector 350 of column 310 in a feature; The flow controller 357 can be designed to modulate valve 20 359. In a feature (Sa) controller 68 is designed to process one or more signals corresponding to a measured variable. Controller 68 can be designed to determine whether The measured variable is above or below a predetermined variable range.The 68 controller can be designed to modulate the operation of one or more devices via communication lines or radio communications (not shown in Figure 1) if the measured variable is below or above a predetermined variable range. For example; when

variable measured outside the range of a predefined variable; The sang Control 68 can be designed to adjust the amount of flow through the valves (359; 379; 359;) and/or 381; Jie to adjust the valve orifice size. Those skilled in the art will recognize that the Control 68 or similar control unit can be located far from FLOW CONTROL UNIT 357 (shown in FIGURE 1); or it can be located at and including the FLOW CONTROL UNIT 357. Fig. 4 shows a flow map of Method 400 according to the detection attributes. Method 400 can be performed using the equipment shown in Figure 3 as previously described. Step 401 includes reception of a first stream into a column mid-section; the first stream comprises acrylonitrile»acetonitrile hydrogen cyanide” and water.Step 402 includes the distillation of the first stream into the column and the production of the first stream a second stream;0 the second stream comprises water which is free Largely from acetonitrile Step 403 includes recycling of the second stream from a lower section of the column to an upper sector of the column Step 4 includes the production of a third stream in the upper sector of the column The third stream comprises acrylonitrile H cyanide shag of water From Stream 1. Step 40 includes 5 to produce a fourth stream comprising water and acetonitrile largely devoid of acrylonitrile and hydrogen cyanide 5 in the upper space of the column's crude acetonitrile concentration zone; The area of concentration of crude acetonitrile is delimited by an inward-facing beam and wall Jf in the midsection of the column; The raw acetonitrile concentration region is in the middle sector of the column. Step 406 involves allowing the fourth stream to flow out of the column. in one of the features; The process can use the following proportions. The ratio of the rate of the first current to the rate of 0 of the second current is about 1.9 to Joa 2.4; in another aspect »about 1.9 to about 2.3; And in another feature; about 2.0 to about 2.2. The ratio of the first stream rate to the third stream rate is about 2 to about 15.5 in the coal feature about 12 to Joa 15) and in the coil feature is about 12 to about 14. The first stream rate to the fifth current rate transmitted to the material shredder Acetonitrile is about 257 to about 315; in a coil feature about 260 to about 310; in another aspect; about 275 to about 300.

Although in the foregoing description this disclosure has been described in relation to certain preferred embodiments thereof; Many details have been mentioned for the purpose of clarification. It is obvious to those skilled in the art that disclosure is subject to additional embodiments and that certain details of the description given here can change significantly without deviating from basic principles of disclosure. It should be understood that detection attributes are subject to modification; or switch; or alteration or replacement without deviating from the content and scope of the disclosure or the scope of the claims. For example; dimensions can be replaced; cate and the size and shape of different components to suit specific applications. Accordingly; The special models shown and described herein are

Document for illustrative purposes only.

Claims (1)

Claims 1- Apparatus for separating crude acetonitrile from acrylonitrile; Comprises: Post with top section; midsection lower sector; The middle sector is designed to receive the “Jol” stream. The first stream includes acrylonitrile ¢, hydrogen cyanide 5 “, acetonitrile “ and water; gee is designed to distill a first stream and produce from the first stream a second stream; The second stream includes water which is largely free of acetonitrile; Shaft designed to recycle the second stream from the lower section to the upper section of the shaft; A shaft designed to produce a third stream in the upper sector of the shaft; The third stream includes acrylonitrile 0 ; hydrogen cyanide and a water part of the first stream; Column comprising a raw acetonitrile concentration zone defined by a beam and an inward-facing wall first in the midsection of the column; The crude acetonitrile concentration region is located in the middle sector of the column.” The crude Je acetonitrile concentration region includes an upper space and a lower space; A column designed to produce a fourth stream in the upper part of the crude acetonitrile concentration zone; The fourth stream comprises water and olay acetonitrile largely from acrylonitrile and hydrogen cyanide The crude acetonitrile concentration region includes an upper outlet in the upper compartment; The upper outlet is designed to allow a vapor stream comprising water and acetonitrile 0 largely devoid of acrylonitrile and hydrogen cyanide to flow outside of the column. 2. prepared in accordance with claim 1; Where the equipment also includes a heat exchanger designed to receive and cool the fourth stream. — 5 1 — 3 - prepared in accordance with claim 2; Also includes top recirculation loop; The upper circulation (sale) loop is designed to recycle at least part of the fourth stream to the crude acetonitrile concentration region after being cooled in the heat exchanger. 4- Equipment Gy of protection element 3, where the concentration area of crude acetonitrile includes crude Je acetonitrile upper inlet in contact with the fluid with the recirculation loop, the upper inlet is designed to receive from the recirculation loop part of the fourth stream after cooling it in the heat exchanger heat exchanger. 0 5 prepared in accordance with claim 4; The upper inlet is placed below the upper outlet in the crude acetonitrile concentration area. 6- Stomach Gy of claim 5 where the crude acetonitrile concentration region comprises a first set of plates; The first set of plates extends between the baffle 5 and the first inward routing wall where the plates of the first set of plates are placed at different heights of the column » Each plate of the first set of plates includes a horizontal plane Jia across a cross-section of the area of concentration of the raw acetonitrile crude acetonitrile; where the crude acetonitrile concentration area includes the daw plate in the lower compartment; upper plate in the upper compartment; And at least one plate between the lower plate and the upper plate with an area of 0 concentration of crude acetonitrile. 7- Prepared according to claim 6”, where the total number of dishes in the area of concentration of crude acetonitrile ranges from 5 to 40. 5 8- Prepared according to claim 6<, where the total number of dishes in the area of concentration of crude acetonitrile is “crude acetonitrile” = 10 to 20. — 6 1 — 9- Prepared according to claim 6, where the upper entrance is placed in the area of crude acetonitrile concentration above the upper plate in the area of crude acetonitrile concentration 10- Prepared according to claim 6 Gus The area of concentration of crude acetonitrile includes crude acetonitrile on a lower outlet placed in the lower compartment and the bottom of the bottom plate in the area of crude acetonitrile concentration. 1- The equipment according to Clause 10, where the lower outlet is designed in the crude acetonitrile concentration zone 0; A sealing basin to receive the liquid from the bottom plate in the crude acetonitrile concentration area. 2- Prepared in accordance with claim 11 (Cus) the crude Hall acetonitrile concentration area also includes a lower recycle loop; the sale lower recycle loop 5 is designed to recycle part at less than a sixth stream from the lower outlet of the crude acetonitrile concentration area to a middle inlet in the middle section of the column; The middle inlet is located below the crude acetonitrile concentration area. 3- Equipment in accordance with Clause 12 (Cus) at least gia of the lower recycle loop 0 is placed outside of the column. 4- Equipment in accordance with Clause 12” where a loop is placed sale] lower recycle Jala loop inside the column 15- prepared according to claim 6) where the column includes a second set of plates; the second set of plates is outside the crude acetonitrile concentration acetonitrile ¢ where — 7 1 — the plates of the second set of plates are placed at different heights of the shaft; Each of the second group of plates includes a horizontal plane extending across a cross-section of the column. 6- Equipment according to Claim 15) where at least one dish from the second group of dishes extends from a second inward-facing wall to the baffle, where the second inner wall is separated from the crude acetonitrile concentration area by means of the baffle. 7- Prepared according to Claim 16, where the total number of the second group of dishes is between eighty and one hundred dishes. 8- Equipment pursuant to claim 16 (where the total number of the second group of dishes is ninety 9- Equipment pursuant to claim 6; Gua the baffle extends vertically through at least one dish 5; the dish shall have at least a horizontal plane extending across a section transverse to the Crude acetonitrile region » and a horizontal plane extending across a cross-section of the column outside the crude acetonitrile region 0 - prepared pursuant to claim 19, wherein the column comprises a second set of plates »0 the second set of plates is located outside the region Crude acetonitrile concentration ¢ Where the plates of the second set of plates are placed at different heights from each other, and each plate of the second set of plates includes a horizontal plane extending across a cross-section of the column. The baffle is on a series of 5 baffle pieces, with each baffle piece extending between pairs of plates of the first set of plates. — 8 1 — 2- Prepared according to claim 1 2 ¢ wherein the column includes a second set of f of plates ¢ The second set of plates is outside the area of concentration of crude acetonitrile ¢ where the plates of the second set of plates are placed at elevations different from the column; Each of the second group of plates includes a horizontal plane extending across a cross-section of the column. 3 - prepared in accordance with claim 1; Where the ratio of the diameter of the middle sector to the diameter of the upper sector is from 1.5 to 2.5. 4- A process to separate acetonitrile from acrylonitrile using Gag 0 equipment for claim 1; The process comprises: supplying a first stream comprising acrylonitrile 18007/00510716 hydrogen cyanide acetonitrile and water to a column; the distillation of the first stream to produce a second stream that includes water and is largely free of acetonitrile; a third stream comprising acrylonitrile ¢ hydrogen cyanide and water; 5 and a fourth stream that includes water and acetonitrile and is largely free of acrylonitrile and hydrogen cyanide, where the fourth stream is from 5 to 9618 by weight acetonitrile. 5. Process pursuant to claim 24; Where the fourth stream is cooled to produce a fifth stream with it from 35 0 to 9678 by weight acetonitrile. 6. Process pursuant to claim 25; As it is transferred from 966 by weight to 9612 by weight from the fourth stream to the acetonitrile splitter. 5 27. Process pursuant to claim 24; Where the ratio of the first current rate to the second current rate is from 1.9 to 2.4. — 9 1 — 8- The process according to Clause 24 where the ratio of the first current rate to the third current rate is from 12 to 15.5. 29. Process pursuant to claim 25; where is the ratio of the first rate current to the fifth rate current Transferred to acetonitrile partitioner 257 to 315. 0 - process according to claim 24; Cus the first stream is supplied to middle section 07 of the column. 1. The process pursuant to claim 24; The middle section includes from 5 to 40 dishes. 2. Process pursuant to claim 31; The middle sector includes from 10 to 20 dishes. 5 33. Process pursuant to claim 24; Where the column includes an upper section and the ratio of the diameter of the middle section to the upper section is from 1.5 to 2.5. , a 0 h ! > Yi A 0 & 3 H A 1 : 0 + ajn i . 8 0 8 0 8 N eS 8 8 8 8 8 8 1 0 N PR en, N Ca e 8 rrr 8 H } 3 8 3 8 3 8 3 8 3 8 3 8 3 8 3 8 3 8 3 8 3 8 3 8 3 8 3 8 3 8 3 8 3 8 3 8 3 8 3 8 3 8 3 8 3 8 3 8 3 8 3 8 3 8 3 8 3 8 3 8 3 8 3 8 3 8 3 8 3 8 3 8 3 8 3 8 3 i 3 i 0 a l 8 i kg AY Eg 1 8 1 l i % 0 0 A N N 2 : 2 : H 2 4 i \ yy yy S 7 5 : 8 y : 3 % 0 3 a a x RN 3 % 7 3 A AAA & 3 1 0 L, 5 : b —— l 2 3 g 3 i a ) 0 1 1 1 l 1 1 1 : 1 1 1 1 1 1 1 1 : 1 1 1 1 1 1 1 : 1 1 1 1 1 1 : 1 1 1 1 1 1 1 : 1 1 1 b 1 > 1 yen of 1 RS SS 1 a 3 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 fee a : : B oF nd a ae they qr a Sat beja raga 1 touch a a b a h: da ¥ m AAA AAA JRE a 1 kick 0 For the #40 H 8 3 nen Ny, & ¥ % : ' 0 0 A § 3 wl i \ ) 3 aya 3 yana & ata nb yes x Pov N i 3 N x 3 N x 3 N x 3 N x 3 N x 3 N x 3 N x 3 N x 3 N x 3 N x 3 N x 3 N x 3 N x 3 N x 3 N x 3 N x 3 N x 3 N x 3 N x 3 N x 3 N x 3 N x 3 N x 3 N x 3 N x 3 N x 3 N x 3 N x 3 N x 3 N x 3 N x 3 N x 3 N x 3 N x 3 N x 3 N x 3 by 3 3 . N x 3 N i 3 N HN i H 3 k N i i i N 3 3 3 N 3 3 3 N 3 3 3 N 3 3 3 N 3 3 3 BR 3 NE 3 AM N : 3 H HN i H 5 5 i 3 H 2 X 3 N i 3 H N aT N 3 3 H [a } H 37 3 i 8 3 H A & i Fry i ee N § EY i § i 4 +3 : EY an, Messi 8 HN 8 vo N 5 Fred Coin Bl 3 1 Lo b 58 i i fa ] } ll sss Toe ace Vo ae yeh l rs Frm can i a § N N 3 pce ate ate a ) i N i 1 + 3 wa N N 3 + 2 Toe ok N 3 4 ¥ a N 3 4 ¥ a N 3 4 ¥ a N 3 4 ¥ a N 3 4 ¥ a N 3 4 ¥ a N 3 4 ¥ a N 3 4 ¥ a N 3 4 are ¥ a HN N | Asn i 2 a 2 N | - i 8 N : 3 i 2 1 8 qa N N i \ i N N 4 8 X i Toa +1 i Bog § 3 N N i EE a for HN N 3 iE SR : : i ?; : i N N N Rk) BONA x § 3 N i} + A mmch a l N HN 8 EY - 3 i 2 N & X i B i} + N 3 5 + 3 oS N 0 : 3 2 8 : : % Y N N 0 1 1 RE let 8 5 N i 3 0 8 i wend fF Rn WN i A a a nt os ae 25 83 AG 1 2 N ania i ¥ 0 A i i : HN 8 ] i 3 N ¥ fT. SUSUR TE NA Ne & 5 0 but 8 Aa AG AY dara ws wa an] AT N Fr aan or 8 7 N 3 8 Bae HN H ] N 8 H H N 8 ] H H N 8 ] H H N 8 ] H H N 8 ] H H N 8 ] H H HN t ] § 1 1 Feng, 3 1 4 % % Maltese H N % i N LE i 8 Tg 3 N 3 0 i : 5 : N 3 0 N N iy & { A N Ye X & y i ¥ 4 & so i i oo FY § N Foot HN he HN : H H H N * H H H H H H H H H H H H HN i i di i i ns ci N ee i de H H H H H H H H H HN N Frances a N Th; 1 Hamlan i 1 ¥ M A L 1 L: B B B STN Lahi A 0 Damn Masi WO 1 C RT Masmad Daei 8 A a aN RE a a f 1 Ed # <3 a n a fi) b i 8 p + & AEN i wr fea dy  {FC poe  Sd i a a a : 1 RN ; Cd 1 b a i i b a solution ¥ & 3 8 a a ¥ a a a A H SY º ss a l a = a alg 1 i ih 1 0 ook, 1 § god aaa aak M 0 a 1 As A A W B 1 0 a NTF Tag Vo is 1) 7 A L 5 AES ENE 0 NE Aes i 5 A AL ALMA 0 L SAH 1 & B KH 1 A 1 . 4 3 3 a ¥ b 3 " 1 } SE j i ¥ : i § ] ah ah ah ah ah ah a wy 2 & i i 3 “Ee TREY ¢ § 1 Pt 1 b Voi. ood TAA LE EE ARES BE Pegs 84 i i YT weg 1 1 . 3h EY 3 >. ry ¥ ¥a TAS H a m FN a RS + 5 a alpha i na J 1 as NL Llp fsa. I a ـــــــــــــــــــــــــــــــــــــ to I ¥ AN ¥ 1 A 3 A 1 A 1 4 DDS 2 A A Bz “B Wos 1 Rad I OD A 1 xn 0 [ANE N 2 º ki 1 : 1 a ~~ i 0 for i x no RE. 1 \ Fr, + 0 1 % A i PL 1 i ak WY ie Ey 1 lah 1 + NEE 1 mr 1 N 0 1 1 1 rum . hd N : 1 b “dm 1 a 1 = i N NN. Co Yous 8 sss 9 i Vn gy a T-s 5 tox Ip ¥ ¥ LY a 0 3 gy 8 5 a 0 2 3 0 a. td ja lakhi el | the first stream in the column and produce from the first stream a second stream that includes the shalt which is empty to a large b from §: nistotetrile: recycling of the second stream from a scolitic sector apa to an upper sector of the column pA! A third AS production in the upper sector of the column comprising acrylonitrile: {HON and a gel of water from the first stream we ry i : c Production of a third AS comprising water and acetonitrile in the upper space 1 + 2 a a A la la a ga 2 ae GEL 2h FY alia A concentration of raw acetyltoyl in the sector Bat with combo £ L Fon 1: Boaedd the hand is common La tend: Agent The rai' is outside the SERB The smog Shape + Sued Authority for Intellectual Property RE .¥ + \ A 0 § 8 Ss o + < M SNE A J > E K J TE I UN BE Ca a a a ww > Ld Ed H Ed - 2 Ld, provided that the annual financial consideration is paid for the patent and that it is not null and void for violating any of the provisions of the patent system, layout designs of integrated circuits, plant varieties and industrial designs, or its implementing regulations. Ad Issued by + bb 0.b The Saudi Authority for Intellectual Property > > > This is PO Box 1011 .| for ria 1*1 v= ; Kingdom | Arabic | For Saudi Arabia, SAIP@SAIP.GOV.SA