CN202876834U - Dimethyl ether catalyst granule - Google Patents

Abstract

The utility model provides a dimethyl ether catalyst granule, and particularly relates to a catalyst granule used for the process of directly preparing dimethyl ether by using a one-step method in a slurry bed reactor. The outer contour line of the radial cross section of the catalyst granule is in a shape of a continuous and smooth gear; and a straight through hole is formed along a middle axis. The catalyst granule has the advantages of high specific surface area and high abrasion resistance.

Description

A kind of dimethyl ether catalyst particle

Technical field

The utility model relates to the solid catalyst particle that uses in a kind of heterogeneous catalytic reaction preparation of dimethyl ether process, relates in particular to a kind of catalyst granules that uses in the one-step method direct preparation of dimethyl ether technique in paste state bed reactor.

Background technology

In the one-step method synthesis process for dimethyl ether, what reactor adopted is paste state bed reactor.Catalyst exists with graininess in the slurries of high gas holdup, and synthesis gas enters into bed and forms tiny homogeneous from the bottom bubble is upward through catalyst bed reaction.So; this technique belongs to gas-liquid-solid reaction; the shape of catalyst and intensity have significant impact to reaction; high specific area can provide the space of more gas-liquid contacts; and high mechanical strength especially scuff resistance for guaranteeing the stable also extremely important of catalytic reaction, because can constantly bump friction in the paste state bed reactor between the catalyst granules, if insufficient strength; particle can break, and too much breaking must affect the catalytic reaction effect.Therefore, to the requirement of catalyst, both need high specific area in this technique, needed again high mechanical strength.

The utility model content

The technical problem that mainly solves in the utility model is to reduce local stress to concentrate when improving the catalyst granules specific area, thereby can improve the scuff resistance of catalyst granules.According to mechanics principle, reduce the concentrated method of stress is to make the monnolithic case of member realize rounding off as far as possible.For this reason, the outer contour of the radial cross-section of catalyst granules main body is continuous, the smooth gear shape that is joined end to end and formed by the tangent minor arc of multistage in the utility model.Because like this characteristic function of the curve of shape has the continuous derivative of single order, thus according in the higher mathematics to the judging rules of smooth curve, the outer contour of catalyst granules cross section is smooth curve in the utility model.Having the frictional force of the in theory minimum except circle and minimum stress on the outer contour of this feature concentrates; And with respect to common cylinder, this gear-like of catalyst granules has higher specific area in the utility model.In sum, the utility model has also significantly reduced local stress when improving the catalyst granules specific area, has reached the effect that improves the catalyst granules scuff resistance.

Concrete technical scheme of the present utility model comprises:

A kind of solid catalyst particle of six gear shapes, the main body axial component is highly to be H, have clear opening along axis, the aperture of clear opening is D, the radial cross-section outer contour of catalyst granules is continuous, smooth six gear shapes, and the circumradius of outer contour is R, and inscribed circle radius is r.

Form above-mentioned catalyst granules main body radial cross-section continuous smooth gear-like outer contour be the curved section (as shown in Figure 1) with following feature: one group of quantity is 6, radius is the circle of β, around central point O, circular array in 0 ° to 360 ° scope; Do following three circles, be that (center of circle among Fig. 1 is O for the inscribed circle of outer contour, radius is the circle of r), and the circumcircle (such as the round S among Fig. 1) of 2 adjacent radiuses circle (such as the round P among Fig. 1 and circle Q) that is β, obtain another and organize quantity and be all 6 circle; Respectively from this circle of two groups, mutually circumscribed (mutually circumscribed with circle S such as circle P among Fig. 1 between any two, circle S is mutually circumscribed with circle Q), each circle is upper to form corresponding 2 point of contacts (such as the some A on the circle P among Fig. 1 and some B, some B on the circle S and some C), get the minor arc between these two point of contacts, these all minor arcs join end to end and consist of this continuously outer contour of smooth gear-like of cross section.

The various relevant parameters of above-mentioned formation catalyst particles grain character are of a size of:

R?=1mm?~3mm；

r?=?0.8R；

H?=?2R?~?2.2R；

β?=?0.2R；

D?=?0.3R。

The utility model outline is smooth continuously, and local stress is little, when improving the catalyst granules specific area, has more significantly improved the scuff resistance of catalyst granules.

Description of drawings

Fig. 1 is that the utility model catalyst granules cross section outer contour forms schematic diagram.

Fig. 2 is the utility model embodiment 1 cross sectional representation (also being the cross sectional representation of embodiment 2 and embodiment 3 simultaneously).

The specific embodiment

Below in conjunction with drawings and Examples the utility model is further detailed:

The marked improvement of technical solutions of the utility model has been to improve the scuff resistance of catalyst granules, and scuff resistance can be investigated by this index of wear rate.Adopt the small-sized seed-coating machine of BY-300A type that Shanghai Huanghai Sea medicine inspection Instr Ltd. produces (stainless steel coating pan diameter 200 mm processed, the coating pan inclination angle is 35 to spend) during the wear rate of specimen particle.During test, every kind of sample is randomly drawed 200, puts into coating pan, the coating pan rotating speed is controlled to be 60 rev/mins, keeps rotating speed to stop after 1 hour, takes out particle, the particle number W that the reading contour structures is complete, meter abrasion of particles rate ω=[(200-W)/200] * 100%.

Related catalyst granules of the present utility model all is according to these particles architectural feature separately in the specific embodiment, adopts same material and facility to prepare.

The following examples only are used for the utility model of explaining in detail, and limit never in any form scope of the present utility model.

Embodiment 1

The cross sectional representation of catalyst granules such as Fig. 2 in the present embodiment, the design parameter size sees Table 1.Catalyst granules body height H=4.4 mm; Clear opening diameter D=0.6 mm; The circumradius R of catalyst granules radial cross-section outer contour=2 mm, inscribed circle radius r=1.6 mm, radius β=0.4 mm.This catalyst granules wear rate ω is 8.5%.

Embodiment 2

The cross sectional representation of catalyst granules such as Fig. 2 in the present embodiment, the design parameter size sees Table 1.Catalyst granules body height H=6.3 mm; Clear opening diameter D=0.9 mm; The circumradius R of catalyst granules radial cross-section outer contour=3 mm, inscribed circle radius r=2.4 mm, radius β=0.6 mm.This catalyst granules wear rate ω is 7%.

Embodiment 3

The cross sectional representation of catalyst granules such as Fig. 2 in the present embodiment, the design parameter size sees Table 1.Catalyst granules body height H=2 mm; Clear opening diameter D=0.3 mm; The circumradius R of catalyst granules radial cross-section outer contour=1 mm, inscribed circle radius r=0.8 mm, radius β=0.2 mm.This catalyst granules wear rate ω is 8%.

Table 1

?	H (mm)	D (mm)	R (mm)	r (mm)	β (mm)	ω %
							Embodiment 1	4.4	0.6	2	1.6	0.4	8.5
Embodiment 2	6.3	0.9	3	2.4	0.6	7
							Embodiment 3	2	0.3	1	0.8	0.2	8

Claims (2)

1. a dimethyl ether catalyst particle is characterized in that the radial cross-section outer contour of catalyst granules is continuous, smooth gear shape, and the circumradius R of outer contour is 1 mm to 3 mm, and inscribed circle radius r is 0.8R; Catalyst granules axial height H is 2R to 2.2R, has the clear opening that diameter D is 0.3R along axis.

2. dimethyl ether catalyst particle as claimed in claim 1, this continuously smooth gear-like outer contour that it is characterized in that the main body radial cross-section is comprised of the curved section with following feature: one group of quantity is 6, radius is the circle of β, β is 0.2R, around central point O, in 0 degree circular array in the 360 degree scopes; Do the inscribed circle of outer contour and 2 adjacent circles that radius is β, it is 6 circle that the circumcircle of these three circles, these circumcircles form another group quantity; From these two groups circles, between any two mutually circumscribed respectively, the minor arc between these two point of contacts is got at corresponding 2 point of contacts of the upper formation of each circle, and these all minor arcs join end to end and consist of this continuously outer contour of smooth gear-like of cross section.

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