The present invention relates to a rotary pressure filter comprising a filter drum, a housing, and at least one separating element which divides a process chamber in a gas-tight manner into a plurality of process portions. A sensor is arranged on the side of at least one separating element that faces the housing. The sensor comprises a coil and a rod which is arranged inside the coil. The rod is designed to be displaced in the coil on the basis of a change in the distance of the separating element from the sensor. The invention further relates to a method for detecting wear of a separating element of a rotary pressure filter.

The present invention relates to a rotary pressure filter, comprising a filter housing, and a filter drum, wherein a plurality of treatment zones comprises at least a suspension insertion zone and a discharge zone, wherein the rotary pressure filter is configured such that a pressure being present in the suspension insertion zone is higher than a pressure being present in the discharge zone, and that, each time a filter cell, coming from the discharge zone and containing gas having the discharge zone's pressure, enters the suspension insertion zone, the pressure of the suspension insertion zone drops, characterized in that the rotary pressure filter further comprises equipment that is configured to reduce and/or to slow the pressure drop of the pressure in the suspension insertion zone each time a filter cell coming from the discharge zone enters the suspension insertion zone.

The present invention relates to a rotary pressure filter, comprising a filter housing, and a filter drum, wherein a plurality of treatment zones comprises at least a suspension insertion zone and a discharge zone, wherein the rotary pressure filter is configured such that a pressure being present in the suspension insertion zone is higher than a pressure being present in the discharge zone, and that, each time a filter cell, coming from the discharge zone and containing gas having the discharge zone's pressure, enters the suspension insertion zone, the pressure of the suspension insertion zone drops, characterized in that the rotary pressure filter further comprises equipment that is configured to reduce and/or to slow the pressure drop of the pressure in the suspension insertion zone each time a filter cell coming from the discharge zone enters the suspension insertion zone.

The invention relates to a rotary pressure filter module (100) which comprises a rotary pressure filter (200) having a plurality of supply lines (302, 318, 330) for supplying a suspension, washing medium, drying medium, and optionally other operating media to be filtered and having a plurality of discharge lines (314, 326, 348) for discharging mother filtrate, washing filtrate, and filter cakes, different sensor devices (306/308/310, 322/324, 334/336, 316, 328, 349) being assigned to the supply lines and the discharge lines, and adjusting devices also being assigned to the supply lines, the rotary pressure filter module (100) additionally comprising a control device (400) which is connected to the sensor devices and the adjusting devices. According to the invention, the decentralised control device (400) assigned to the rotary pressure filter (200) is arranged on the rotary pressure filter (200) or in its immediate vicinity and has a signal input via which it can be brought into data exchange connection with a central control device, which does not belong to the rotary pressure filter module (100), of a higher-level production system.

The invention relates to a rotary pressure filter module (100) which comprises a rotary pressure filter (200) having a plurality of supply lines (302, 318, 330) for supplying a suspension, washing medium, drying medium, and optionally other operating media to be filtered and having a plurality of discharge lines (314, 326, 348) for discharging mother filtrate, washing filtrate, and filter cakes, different sensor devices (306/308/310, 322/324, 334/336, 316, 328, 349) being assigned to the supply lines and the discharge lines, and adjusting devices also being assigned to the supply lines, the rotary pressure filter module (100) additionally comprising a control device (400) which is connected to the sensor devices and the adjusting devices. According to the invention, the decentralised control device (400) assigned to the rotary pressure filter (200) is arranged on the rotary pressure filter (200) or in its immediate vicinity and has a signal input via which it can be brought into data exchange connection with a central control device, which does not belong to the rotary pressure filter module (100), of a higher-level production system.

Solid/liquid separation processes using a large pore filter. One aspect of the disclosure is a process comprising filtering a solid/liquid mixture of a collection of solid aromatic carboxylic acid particles in a solvent in a first zone of a rotary pressure filter apparatus to form a filter cake on a filter surface, and removing the filter cake from the filter surface.

Solid/liquid separation processes using a large pore filter. One aspect of the disclosure is a process comprising filtering a solid/liquid mixture of a collection of solid aromatic carboxylic acid particles in a solvent in a first zone of a rotary pressure filter apparatus to form a filter cake on a filter surface, and removing the filter cake from the filter surface.

Solid/liquid separation processes using a large pore filter. One aspect of the disclosure is a process comprising filtering a solid/liquid mixture of a collection of solid aromatic carboxylic acid particles in a solvent in a first zone of a rotary pressure filter apparatus to form a filter cake on a filter surface, and removing the filter cake from the filter surface.

Solid/liquid separation processes using a large pore filter. One aspect of the disclosure is a process comprising filtering a solid/liquid mixture of a collection of solid aromatic carboxylic acid particles in a solvent in a first zone of a rotary pressure filter apparatus to form a filter cake on a filter surface, and removing the filter cake from the filter surface.

A pulp-filter arrangement (1) comprises a rotatable drum (10) and a non-rotating valve arrangement (30). The rotatable drum (10) has a cylindrical water-permeable pulp-supporting shell (14), a plurality of drain pipes (16) and a rotating hollow shaft (18). The plurality of drainpipes (16) connects the rotating hollow shaft (18) with a collecting channel (22) situated radially directly inside the cylindrical water-permeable pulp-supporting shell (14). The non-rotating valve arrangement (30) is disposed within the rotating hollow shaft (18) for sealing off the rotating hollow shaft (18) from a radially inner outlet (24) of the drain pipes (16) when respective radially inner outlet (24) is situated within a sealed zone. The non-rotating valve arrangement (30) is further arranged to, in a transition zone immediately following the sealed zone, open a throttled passage between the rotating hollow shaft (18) and the radially inner outlet (24).