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Method for preparing isobutylene by cracking methyl tert-butyl ether

A technology of isobutylene and methanol, applied in chemical/physical process, physical/chemical process catalyst, hydrocarbon production from oxygen-containing organic compounds, etc., can solve the problem of no TBA, no information on component removal, etc.

Active Publication Date: 2011-01-12
EVONIK OPERATIONS GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this combination of synthesis and cleavage is the subject of many patents, little information is given on the removal of these components, especially in the case of TBA

Method used

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  • Method for preparing isobutylene by cracking methyl tert-butyl ether
  • Method for preparing isobutylene by cracking methyl tert-butyl ether
  • Method for preparing isobutylene by cracking methyl tert-butyl ether

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach b1

[0216] The MTBE / methanol azeotrope (XL) can be fully or partially recycled to the process. Preference is given to recycling into process step a) or b). Particular preference is given to recycling to one of the columns T-21, T-22 or T-23 of preferred embodiments [b1], [b2], [b3] or [b4], or to the reaction of embodiment [b4] Device R-21.

[0217] Figure 10 One embodiment [e1] of process step [e] is shown. The removal of water from fraction (VII) takes place only in one distillation column T-51. Here, water is obtained as bottom product (XLI) and a water-depleted fraction (VIII) is obtained as top product. The removal of water carried out in column T-51 corresponds to the aforementioned embodiment AFF7.

[0218] Figure 11 One embodiment [e2] of process step [e] is shown. The removal of water from fraction (VII) takes place in two distillation columns operating in double pressure distillation. This corresponds to the above-described embodiment AFF8. In the first column...

Embodiment 1

[0226] Various amounts of water were added to the synthetically produced mixture of raffinate I and methanol. This mixture was then introduced into a laboratory reactor. The reactor was a tubular reactor (length 1000 mm, internal diameter 21 mm) with a cooling jacket through which heat transfer oil (Marlotherm SH from Sasol Olefins & Surfactants GmbH) flowed.

[0227] Using an acidic ion exchanger, i.e. 15 (Rohm & Haas), as a catalyst. The catalyst used has an average diameter of 0.6-0.85mm and a surface area of ​​45m 2 / g with a bulk density of 770g / l. The acid capacity of the catalyst, based on wet catalyst, was 1.7 equivalents / ml.

[0228] The feed mixture was preheated to 36°C in a heat exchanger before entering the reactor, and the jacket temperature was also set at 38°C in all experiments (Marlotherm temperature at reactor jacket inlet). The pressure is set to a constant 1.2MPa by means of a pressure maintaining device located at the end of the reactor (绝对) . The...

Embodiment 2

[0237] Embodiment 2: (according to the present invention)

[0238] Example 2 and figure 1 The method shown corresponds to that in which the reaction of isobutene is assumed according to figure 2A variant of [a1], for MTBE distillation is assumed according to Figure 5 A variant of [b3], for the purification of cleavage products is assumed based on Figure 8 variant [d1], and finally assumed for drying according to Figure 10 A variant of [e1].

[0239] Assumed a 10000 kg / h C4 hydrocarbon stream (II) with the composition shown in Table 5 (typical raffinate I, see Table 1) as a basis figure 1 or 2 for the feed of the device. The composition of the fresh methanol introduced and the recycle stream (VIII) from process step [e] is likewise shown in Table 5. The amount of fresh methanol was adjusted so that a methanol to isobutene molar ratio of 1.14 was achieved in the feed to the first reactor.

[0240] Table 5: Composition of feed stream (II), fresh methanol (IX) and rec...

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Abstract

The invention relates to a method for preparing isobutylene by cracking methyl tert-butyl ether(MTBE), comprising the following steps of: a) synthesis of MTBE; b) separation of MTBE; c) cracking of MTBE; d) separation of isobutylene; e) removal of water; and f) recirculation; the invention further relates to a tube-bundle device with the following units: i) tube bundle, ii) tube plate, iii) baffle, iv) inner shell, v) a pressure-bearing shell comprising at least one inlet and outlet; and vi) a shell-inner space including a heat-releasing or heat-absorbing fluid, wherein the inner shell is connected with the baffle on the tube bundle length and the tube plate without gap or with a small gap, the fluid in the shell-inner space surrounds the inner shell from two sides.

Description

technical field [0001] The invention relates to a process for the preparation of isobutene by cleavage (Spaltung) of methyl tert-butyl ether (MTBE). Background technique [0002] Isobutylene is a starting material for the manufacture of many products, such as butyl rubber, polyisobutylene, isobutylene oligomers and tert-butyl aromatics. In addition, isobutene can also be used as a precursor for the preparation of methacrylic acid and its esters. [0003] In industrial streams, for example in the C4 fraction of petroleum crackers, isobutene is often present together with saturated and unsaturated C4 hydrocarbons. Isobutene cannot be separated economically from these mixtures by distillation due to the low boiling point difference or the very low separation coefficient between isobutene and 1-butene. Isobutene is therefore usually separated from industrial hydrocarbon mixtures by converting the isobutene into derivatives which are easily separated from the rest of the hydroc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/09C07C1/20C07C1/24B01J8/06
CPCC07C11/09C07C1/20B01J31/02C07C1/22C07C7/08
Inventor M·温特伯格D·罗特格A·里克斯R·布科尔W·卢H·韦德霍尔德G·希林C·博英
Owner EVONIK OPERATIONS GMBH
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