SU944924A1 - Method of drying and extracting wood - Google Patents

Description

The invention relates to a drying method with simultaneous extraction of wood and can be applied in the wood processing industry. "

There is a known method of drying with simultaneous extraction of wood by mechanical extraction of moisture, in the direction of the longitudinal axis under the action of the pressure difference created by the position of the workpieces radially in the field of centrifugal forces 1.

Closest to the proposed technical solution is a method of drying and extracting wood, including the removal of capillary moisture from the pore space of wood by bringing to the ends of the workpiece electrodes with an external electric field of constant polarity (2.

The disadvantage of this method is the partial and delayed extraction of woody liquids containing resinous carbohydrates.

The purpose of the invention is to extract a woody liquid containing resinous carbohydrates.

This is achieved by simultaneously with exposure of wood to an electric field, metal ions from groups III and IV of the Periodic System are introduced into its pore space, and metal ions are introduced by anodic dissolution of the electrode while collecting wood liquid at the anode and cathode.

The table shows the concentration and chemical composition of resinous components and carbohydrates.

ten

Paper chromatography of pine, mg: galactan 727; Araban 198. The ratio of galactan to Arban is 3.7: 1.

Pine: the amount of resin per 100 ml of solution, g: cathode 0.659, anode 0.024.

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Removing the wood liquid in this way showed that the concentration of resinous components (spruce, pine) at the cathode is 12–20 times higher than that at the anode, and the concentration of hydrocarbons (birch, maple) at the anode is 1015 times higher than at the cathode.

The drawing shows the scheme of implementation of the method.

Wood drying and extraction

25 involves removing capillary moisture from the pore space of wood by supplying the ends of the workpiece 1 with electrodes 2 with an external electric field of constant polarity, which Tojxae30 is powered by a controlled high voltage rectifier 3, and the electrodes 2 pressed against the ends of the workpiece 1 with devices 4 fixed on a common frame 5. Example. Freshly cut samples of Scots pine and Dahurian larch are subjected to drying and extraction. Characteristics of pine specimens: length 29.8 cm, fomina round, diameter 9.9 cm, weight 1990 g, density 870 kg / m (mass and density are averaged over 50 samples), Characteristic of hardwood specimens, triangular shape, length 23.5 cm, height 7.1 cm, base length 12.6 cm, weight 1055 g, density 947 kg / m (weight and density are averaged over 36 samples). Titanium was used as electrodes superimposed on the ends of the samples. The voltage gradient of the electric field is 6–14 V / cm. The strength of the current (as the sample dries, the strength of the current decreases) is 0.05–0.25 A. The drying time with extraction is 20–30 min. The amount of liquid flowing out for a pine sample is 210 ml, for a larch sample 160 ml, the amount of liquid flowing to the cathode, for a pine sample 180 ml, for larch one 120 ml. The temperature of the extracted liquid is 222 ° C at an ambient temperature of 18–20 ° C. The final relative humidity of the samples ranges from 40 to 50%, i.e. reduced by removing free moisture from the capillary-pore space of wood, 2.5 times. The energy consumption for dehydration with the used power source (laboratory scheme including the ATP-1 autotransformer 1, high-voltage transformer, diode bridge with a capacitor filter) is O, 20, 4 kWh / l (in terms of 1 l remote moisture) according to compared with the base case.

Phosmula invention

A method of drying and extracting wood, which involves removing capillary moisture from the first space of Wood by supplying a billet of electrodes with an external electric field of constant polarity to the end, characterized in that it is used to extract wood. In the spring of a liquid containing resinous carbohydrates, metal ions of groups III and IV of the Periodic System are introduced into the pore space simultaneously with an electric field, and metal ions are introduced by anodic dissolution of the electrode while simultaneously collecting wood liquid at the anode and cathode.

 Sources of information taken into account in the examination

1. USSR author's certificate No. 450064, cl. F.26 5/08, 1972.

2. Vlasov A.A. and Krvlov N.A. Electroosmatic wood drying. Calloid Hall 3, 1937, p. 34

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Claims (1)

Claim A method of drying and extracting wood, including the removal of capillary moisture from the pore space of the Wood by supplying to the ends of the workpiece electrodes with an external electric field of constant polarity, characterized in that, in order to extract wood. in the spring, a liquid containing resinous carbohydrates, simultaneously with exposure to wood by an electric field, metal ions of groups III and IV of the Periodic system are introduced into its pore space, and metal ions are introduced by anodic dissolution of the electrode with simultaneous collection of wood fluid at the anode and cathode.