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Adsorbent based on a zeolite and a silica-rich clay, and process for purifying hydrocarbon feeds

An adsorbent, zeolite technology, applied in adsorption purification/separation, chemical instruments and methods, separation methods, etc., can solve the problems of complex and more expensive forming methods, reducing adsorption capacity, etc.

Inactive Publication Date: 2014-12-24
INST FR DU PETROLE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Known zeolite adsorbents have one major disadvantage: During successive adsorption-desorption cycles, coke molecules are formed inside the pores of the zeolite adsorbent, thus reducing their adsorption capacity
This document reveals to us that in order for the final solid to have acceptable mechanical strength properties, it is possible to manufacture this type of solid only by including the step of forming zeolite, which makes the method for shaping more complex and expensive

Method used

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  • Adsorbent based on a zeolite and a silica-rich clay, and process for purifying hydrocarbon feeds

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0094] This additive will be removed during the heat treatment of step (d) of the production process of the invention.

[0095] Said step (b) is advantageously carried out in a ram extruder, single screw extruder or twin screw extruder.

[0096] In this case, additives may optionally be added to the mixing step (a). The presence of said additives facilitates extrusion.

[0097] In the case where the production process is carried out continuously, the mixing step (a) can be combined with step (b) for shaping by extrusion in the same equipment. In this embodiment, the mixture is extruded, also referred to as "mixed slurry", for example by extrusion directly from the end of a continuous twin-screw type mixer, or by mixing one or more machine connected to the extruder to execute. The geometry of the die that gives the extrudate its shape may be selected from dies known to those skilled in the art. Thus, the mold can be, for example, cylindrical, multi-lobed, channeled or groov...

Embodiment

[0139] NaX zeolite extrudates were synthesized as follows:

[0140] The zeolite and binder powders were introduced into the chamber of a mixer (Plastograph, Brabeender), deionized water was added by syringe over about 2 minutes and mixed. The mixture was then mixed for 20 minutes at 25 rpm.

[0141] The resulting slurry was then extruded through a cylindrical die with a diameter of 1.8 mm (ram extruder). Finally, the rods were dried overnight at 80°C and calcined at 550°C in air.

[0142] For comparison, Examples A to F have various clay or oxide type binders prepared using the same procedure (Table 2). The Si / Al weight ratios of the various binders and the amounts of their various impurities are shown in Table 1 below.

[0143]

[0144] Table 1: Properties of binder, Si / Al weight ratio, impurities

[0145]

[0146] * weight%

[0147] Then, the reactivity of the adsorbent was tested as follows. First, the adsorbent was activated at 400 °C for 2 h in nitrogen. Then, ...

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Abstract

The present invention concerns an adsorbent comprising at least one zeolite selected from a zeolite of the 12 MR, 10 MR and 8 MR type and at least one binder comprising a clay with a Si / Al weight ratio of more than 2. It also concerns its preparation process and its use in a process for purifying a hydrocarbon feed comprising unsaturated molecules and at least one impurity comprising at least one heteroatom of the O, S or N type.

Description

technical field [0001] The present invention relates to the field of processes for the purification of hydrocarbon feeds comprising unsaturated molecules in which heteroatom-containing impurities contained in those hydrocarbon feeds are removed by adsorption onto zeolite adsorbents. [0002] Background technique [0003] It is known to those skilled in the art that molecules containing heteroatoms (oxygen, sulfur, nitrogen, etc.) have a detrimental effect on the function of a large number of industrial catalysts. In effect, those compounds are deposited on the active sites of the catalyst, thereby deactivating it and no longer active to catalyze the reaction. Therefore, many patents propose to extract these impurities in the cut upstream of the catalytic reactor. [0004] The most effective technique for extracting this impurity is to use an adsorbent with a specific affinity for the impurity. The principle of purification of a feed by adsorption is very simple. A fluid ...

Claims

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Application Information

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IPC IPC(8): B01J20/18B01J20/30C10G25/00C07C7/13C07C11/20
CPCB01D53/02B01D2253/1085B01D2253/11B01D2256/24B01J20/183B01J20/186B01J20/2803B01J20/3007B01J20/3078C10G25/03C10G25/05B01J20/12B01J20/18C01B37/00C01B39/00
Inventor E. 布拉科D. 马蒂E. 若利迈特尔D. 巴泽尔-巴希J. 洛佩
Owner INST FR DU PETROLE
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