Pretreatment process for improving the filling of a chamber with solid particles

Patent metadata

Field	Value
Publication number	US-11235300-B2
Application number	US-201816956998-A
Country	US
Kind code	B2
Filing date	Nov 30, 2018
Priority date	Dec 21, 2017
Publication date	Feb 1, 2022
Grant date	Feb 1, 2022

Abstract

The invention relates to a pretreatment process for improving the filling of a chamber with solid particles, in which said solid particles are mixed before loading of said solid particles into the chamber with at least one lubricant that is solid at ambient temperature chosen from saturated fatty acids having 14 or more carbon atoms, metal salts of saturated fatty acids having 14 or more carbon atoms, esters of fatty acids having 14 or more carbon atoms, fatty alcohols having 14 or more carbon atoms, linear N-alkanes having 16 or more carbon atoms in solid form, fumaric acid, talc, sodium stearoyl fumarate, the lubricant being introduced at a content of between 0.01% and 1% relative to the total weight of the mixture of solid particles and lubricant. The invention also relates to the use of the process for the pretreatment of particles of adsorbents for the separation of xylenes.

First claim

The invention claimed is:

1. A pretreatment process for improving the filling of a chamber with solid particles, comprising mixing said solid particles, before loading of said solid particles into the chamber, with at least one lubricant that is solid at ambient temperature chosen from saturated fatty acids having 14 or more carbon atoms, metal salts of saturated fatty acids having 14 or more carbon atoms, esters of fatty acids having 14 or more carbon atoms, fatty alcohols having 14 or more carbon atoms, linear N-alkanes having 16 or more carbon atoms in solid form, fumaric acid, talc or sodium stearoyl fumarate, the lubricant being introduced at a content of between 0.01% and 1% relative to the total weight of the mixture of solid particles and lubricant, and then loading the solid particles mixed with lubricant into the chamber, the loading being carried out manually with the aid of a flexible hose or the loading being carried out with the aid of a functional device internal to the chamber which may be introduced into and/or withdrawn from said chamber.

2. The process according to claim 1 , wherein the loading is carried out manually with the aid of a flexible hose.

3. The process according to claim 1 , wherein the loading is carried out with the aid of a functional device internal to the chamber which may be introduced into and/or withdrawn from said chamber.

4. The process according to claim 3 , wherein the functional device internal to the chamber comprises, in an upper part, a means for feeding with particles and, in a base located inside the chamber to be loaded, a dispersion system attached to a central shaft rotated about a substantially vertical axis by a motor means, and a feed pipe at least partially surrounding the central shaft, said central shaft is a tube having an internal diameter sufficient to make it possible to carry out, in the zone to be loaded, by means of this tube and during the loading period, a certain number of operations connected or complementary to said loading operation, this device comprising a stationary tube attached to the feed pipe and placed inside said rotary central shaft, the stationary tube and said rotary central shaft being substantially coaxial.

5. The process according to claim 1 , wherein the lubricant content is between 0.01% and 0.5% by weight.

6. The process according to claim 5 , wherein the lubricant content is between 0.05% and 0.25% by weight.

7. The process according to claim 1 , wherein the lubricant is a fatty acid chosen from myristic acid, palmitic acid, stearic acid, arachidic acid, behenic acid, lignoceric acid or cerotic acid, or a metal salt of saturated fatty acids having 14 or more carbon atoms, chosen from salts based on aluminium, calcium, magnesium, zinc, sodium, barium or lithium, a fatty alcohol having 14 or more carbon atoms chosen from myristyl alcohol, palmityl alcohol or stearyl alcohol, a paraffin having 16 or more carbon atoms, an ester of saturated fatty acids having 14 or more carbon atoms chosen from the following compounds: glyceryl monostearate, glyceryl distearate, glyceryl monopalmitate, glyceryl dipalmitate, glyceryl tristearate, glyceryl tripalmitate, glyceryl trimyristate or glyceryl tribenhenate.

8. The process according to claim 1 , wherein the lubricant is chosen from magnesium stearate, calcium stearate and barium stearate.

9. The process according to claim 8 , wherein the lubricant is magnesium stearate.

10. The process according to claim 1 , wherein the solid particles are particles of catalysts or particles of adsorbents.

11. The process according to claim 1 , wherein the solid particles are in the form of beads or extrudates.

12. The process according to claim 1 , wherein the equivalent diameter of the solid particles is less than 2 mm.

13. The process according to claim 1 , wherein the lubricant is in the form of particles which have a particle size such that at least 90% by weight of the particles of lubricant pass through a 90 μm screen.

14. The process according to claim 1 , wherein the mixing is carried out at ambient temperature and atmospheric pressure in a drum-type mixer.

15. The process according to claim 14 , wherein the mixing is carried out with a speed of rotation of between 5 and 30 rpm, for a time of between 5 min and 20 min, and with a degree of filling in the tank of the mixer of between 30% and 80%.

16. The process according to claim 1 , wherein the chamber is a chemical or electrochemical, petroleum or petrochemical reactor.

17. A process for the pretreatment of particles of adsorbents and for the separation of xylenes comprising conducting the process of claim 1 and contacting the resulting particles with xylenes.

Assignees

• Ifp Energies Now

Inventors

• Blancke Guillaume
• Josserand Morgane
• Richard Danielle
• Laroche Catherine

Classifications

• C07C7/12

  by adsorption, i.e. purification or separation of hydrocarbons with the aid of solids, e.g. with ion-exchangers · CPC title

• B01J8/008

  Details of the reactor or of the particulate material; Processes to increase or to retard the rate of reaction (B01J8/0285, B01J8/067, B01J8/087, B01J8/1836 take precedence) · CPC title

• C07C15/08

  Xylenes · CPC title

• B01J2/30 Primary

  using agents to prevent the granules sticking together; Rendering particulate materials free flowing in general, e.g. making them hydrophobic · CPC title

• C10M105/36

  of polycarboxylic acids · CPC title