阅读说明：本技术 一种木质纤维生产工艺 (Wood fiber production process ) 是由 李亚龙 于 2021-02-02 设计创作，主要内容包括：本发明提供了一种木质纤维生产工艺,其包括步骤：合格木片、浸渍液和0.1～5%的木质纤维松软剂混合,常压条件下,在90～140℃预蒸50～120 min；其中,按照合格木片中绝干质量计量,绝干质量：浸渍液=(1～5)：5；预蒸后的木片依次进行搓丝、微轻压蒸煮、搓丝细化、一段精磨、二段精磨得到成品纤维；成品纤维中添加H-2O-2消毒剂与ClO-2净化剂,常温常压下消毒净化60～130 min；消毒净化后,成品纤维进入消潜贮存池停留20～30 min,再筛选得到良纤维,良纤维经浓缩、清洗、脱水后送至纤维贮存仓储存或压制成纤维板块。该木质纤维生产工艺中所产生的废弃物可以再利用,有效兼顾经济效益和环境效益。(The invention provides a wood fiber production process, which comprises the following steps: mixing the qualified wood chips, the impregnation liquid and 0.1-5% of a wood fiber softening agent, and pre-steaming for 50-120 min at 90-140 ℃ under the normal pressure condition; wherein, the oven dry mass is measured according to the oven dry mass in the qualified wood chips: impregnation liquid = (1-5): 5; the pre-steamed wood chips are sequentially subjected to thread rolling, slight pressure cooking, thread rolling refining, first-stage fine grinding and second-stage fine grinding to obtain finished fibers; h is added into finished fiber 2 O 2 Disinfectant and ClO 2 The purifying agent is sterilized and purified for 60-130 min at normal temperature and normal pressure; after disinfection and purification, the finished fiber enters into the sterilizerAnd (3) staying in the latent storage pool for 20-30 min, screening to obtain good fibers, and concentrating, cleaning and dehydrating the good fibers, and then conveying the good fibers to a fiber storage bin for storage or pressing the good fibers into fiber plates. The waste generated in the wood fiber production process can be recycled, and the economic benefit and the environmental benefit are effectively considered.)

1. A process for producing wood fibers comprising the steps of:

pre-steaming the qualified wood chips, mixing the pre-steamed wood chips with impregnating solution and 0.1-5% of wood fiber softening agent, and pre-steaming at 90-140 ℃ for 50-120 min under the normal pressure condition; wherein, the oven dry mass is measured according to the oven dry mass in the qualified wood chips: impregnation liquid = (1-5): 5;

the wood chips after the fiber preparation and pre-steaming are sequentially subjected to thread rolling, slight pressure cooking, thread rolling refinement, first-stage fine grinding and second-stage fine grinding to obtain finished fibers;

collecting and recycling the steeping liquor, and collecting and recycling the steeping liquor obtained after slight light pressure cooking and thread rolling refining extrusion for the next slight light pressure cooking process; the recycling of the impregnation liquid can reduce the normal addition of the wood fiber softening agent by 20-50% next time;

h is added into the disinfection and purification finished product fiber₂O₂Disinfectant and ClO₂The purifying agent is sterilized and purified for 60-130 min at normal temperature and normal pressure; wherein H₂O₂5-8% of disinfectant, and ClO₂The dosage of the purifying agent is 2-3%;

after screening, sterilizing and purifying, the finished fiber enters a latency storage pool to stay for 20-30 min, then screening is carried out to obtain good fiber, and the good fiber is concentrated, cleaned and dehydrated and then sent to a fiber storage bin to be stored or pressed into a fiber plate.

2. The wood fiber production process according to claim 1, wherein the wood fiber softening agent comprises, by mass, 1 to 10 parts of phosphoric acid, 1 to 10 parts of formic acid, 1 to 10 parts of nitrous acid, 1 to 10 parts of lauryl alcohol polyoxyethylene ether (AEO), 3 to 9 parts of nonylphenol polyoxyethylene ether (APE), 2 to 8 parts of polyoxyethylene dodecylamine, 1 to 10 parts of polyoxyethylene amide, 1 to 8 parts of butyl carbitol, 2 to 7 parts of phenoxyethanol, 2 to 10 parts of sodium sulfite, 1 to 6 parts of sodium dodecyl sulfonate, and 30 to 60 parts of deionized water.

3. The lignocellulosic production process according to claim 1 or 2, wherein: the pressure in the slight pressure cooking process is 0.05-0.2 Mpa, the temperature is 90-140 ℃, and the time is 50-120 min.

4. The lignocellulosic fiber production process of claim 1, wherein: adding a pH regulator before the first-stage fine grinding to regulate the pH to 7-8, wherein the pH regulator is selected from Na₂SiO₃、NaHCO₃、Na₂CO₃、NaOH、KHCO₃、K₂CO₃One or more of (a).

5. The lignocellulosic fiber production process of claim 4, wherein: in the first stage of fine grinding, the concentration of the inlet fibers is 30-40%; in the second-stage fine grinding step, the concentration of the inlet fibers is 35-45%.

6. The lignocellulosic fiber production process of claim 1, wherein: and after the second-stage fine grinding step, performing heat recovery, diluting the fiber concentration to 30-35%, and concentrating the fiber concentration to 40-50% to obtain the finished fiber.

7. The lignocellulosic fiber production process of claim 1, wherein: the good fiber is a fiber with the fiber length of 1-15 mm, the fiber bundle content of less than or equal to 0.2%, the opacity of 92-94% and the breaking length of 3.5-4.5 km.

8. The lignocellulosic fiber production process of claim 1 further comprising a step of slag fiber treatment comprising: and fine grinding and screening the slag fiber again, concentrating, cleaning and dehydrating the screened good fiber, then conveying the good fiber to a fiber storage bin for storage or pressing the good fiber into a fiber plate, and discharging the slag fiber through a sand remover.

9. The lignocellulosic process of claim 1 further comprising the step of preparing stock, the step comprising: the wood raw material is sequentially subjected to the procedures of peeling, chipping, screening, washing, dehydrating and drying to obtain qualified wood chips.

10. The lignocellulosic fiber production process of claim 1, wherein: the qualified wood chips are 10-70 mm long, 5-30 mm wide, 3-15 mm thick and have the water content of less than 50%.

Technical Field

The invention relates to the field of wood fiber production, in particular to a wood fiber production process.

Background

The wood fiber is a biomass resource with good application prospect, exists in various woods, is the most abundant renewable resource on the earth, and has extremely wide application. However, the existing wood fiber production process mainly comprises the steps of raw wood chipping, wood chip screening and cleaning, cooking, hot grinding, drying and the like, and the disinfection and sterilization steps are not performed, so that the application of wood fiber in the fields of textile, family, medical use, infant and baby, old age maintenance, packaging, environmental decoration and the like is greatly limited, and meanwhile, a large amount of waste liquid generated in the production process cannot be recycled, and environmental pollution is easily caused. Especially, the cooking process in the production process of the wood fiber mainly comprises an acid method and an alkaline method. The acid method can effectively degrade hemicellulose, but concentrated acid has corrosion problem on equipment, and dilute acid treatment can reduce the corrosion strength on the equipment, but the required temperature and pressure are higher; the alkaline process can destroy lignin, but can produce a large amount of black liquor, causing environmental pollution.

In order to solve the above problems, people are always seeking an ideal technical solution.

Disclosure of Invention

The invention aims to overcome the defects of the prior art, and provides a wood fiber production process.

In order to achieve the purpose, the invention adopts the technical scheme that:

a process for producing wood fibers comprising the steps of:

pre-steaming the qualified wood chips, mixing the pre-steamed wood chips with impregnating solution and 0.1-5% of wood fiber softening agent, and pre-steaming at 90-140 ℃ for 50-120 min under the normal pressure condition; wherein, the oven dry mass is measured according to the oven dry mass in the qualified wood chips: impregnation liquid = (1-5): 5;

the wood chips after the fiber preparation and pre-steaming are sequentially subjected to thread rolling, slight pressure cooking, thread rolling refinement, first-stage fine grinding and second-stage fine grinding to obtain finished fibers;

collecting and recycling the steeping liquor, and collecting and recycling the steeping liquor obtained after slight light pressure cooking and thread rolling refining extrusion for the next slight light pressure cooking process; the recycling of the impregnation liquid can reduce the normal addition of the wood fiber softening agent by 20-50% next time;

h is added into the disinfection and purification finished product fiber₂O₂Disinfectant and ClO₂The purifying agent is sterilized and purified for 60-130 min at normal temperature and normal pressure; wherein H₂O₂5-8% of disinfectant, and ClO₂The dosage of the purifying agent is 2-3%;

after screening, sterilizing and purifying, the finished fiber enters a latency storage pool to stay for 20-30 min, then screening is carried out to obtain good fiber, and the good fiber is concentrated, cleaned and dehydrated and then sent to a fiber storage bin to be stored or pressed into a fiber plate.

Wherein the oven-dried quality of the wood chips is the quality of the qualified wood chips which are placed in a 105 ℃ oven and dried to constant weight.

Based on the above, the wood fiber softening agent comprises, by mass, 1-10 parts of phosphoric acid, 1-10 parts of formic acid, 1-10 parts of nitrous acid, 1-10 parts of lauryl alcohol polyoxyethylene ether (AEO), 3-9 parts of nonylphenol polyoxyethylene ether (APE), 2-8 parts of polyoxyethylene dodecylamine, 1-10 parts of polyoxyethylene amide, 1-8 parts of butyl carbitol, 2-7 parts of phenoxyethanol, 2-10 parts of sodium sulfite, 1-6 parts of sodium dodecyl sulfonate and 30-60 parts of deionized water.

Based on the above, the pressure in the slight pressure cooking process is 0.05-0.2 Mpa, the temperature is 90-140 ℃, and the time is 50-120 min.

Based on the above, before the first stage of fine grinding, adding a pH regulator to regulate the pH to 7-8, wherein the pH regulator is selected from Na₂SiO₃、NaHCO₃、Na₂CO₃、NaOH、KHCO₃、K₂CO₃One or more of (a).

Based on the above, in the first stage of fine grinding step, the concentration of the inlet fibers is 30-40%; in the second-stage fine grinding step, the concentration of the inlet fibers is 35-45%.

Based on the above, after the second-stage fine grinding step, heat recovery is performed, then the fiber concentration is diluted to 30-35%, and the fiber concentration is concentrated to 40-50%, so that the finished fiber is obtained.

Based on the above, the good fiber is a fiber with a fiber length of 1-15 mm, a fiber bundle content of less than or equal to 0.2%, an opacity of 92-94% and a breaking length of 3.5-4.5 km.

Based on the above, the wood fiber production process further comprises a step of slag fiber treatment, which comprises the following steps: and fine grinding and screening the slag fiber again, concentrating, cleaning and dehydrating the screened good fiber, then conveying the good fiber to a fiber storage bin for storage or pressing the good fiber into a fiber plate, and discharging the slag fiber through a sand remover.

Based on the above, the wood fiber production process further comprises the step of preparing materials, and the step comprises the following steps: the wood raw material is sequentially subjected to the procedures of peeling, chipping, screening, washing, dehydrating and drying to obtain qualified wood chips.

Based on the above, the qualified wood chips are wood chips with the length of 10-70 mm, the width of 5-30 mm, the thickness of 3-15 mm and the water content of less than 50%.

Compared with the prior art, the wood fiber production process has outstanding substantive characteristics and remarkable progress, and particularly provides the wood fiber production process which mainly comprises pre-steaming, fiber preparation, disinfection and purification and screening, waste generated in the process can be recycled, economic benefits and environmental benefits are fully considered, environmental pollution is avoided, and production cost can be reduced.

Specifically, the wood fiber softening agent is added in the pre-steaming process, the acid used by the wood fiber softening agent is medium strong acid, the acidity is much weaker than that of the strong acid, the equipment cannot be obviously corroded, the hemicellulose in the wood chips is well degraded, and a good infiltration environment is provided by using dodecyl alcohol polyoxyethylene ether, nonylphenol polyoxyethylene ether and the like, so that the wood fiber softening agent can be fully wetted and infiltrated into the wood fibers, and the degradation rate of the hemicellulose is accelerated. The fiber preparation process after the pre-steaming process is mainly obtained by thread rolling, slight pressure cooking, thread rolling refining, first-stage fine grinding and second-stage fine grinding, so that the fiber is prevented from being damaged, meanwhile, the fiber after the fine grinding is disinfected, purified and screened, the prepared fiber is conveniently applied to the fields of spinning, families, medical use, infants, old people, packaging, environment decoration and the like, and the application range of the wood fiber is effectively expanded; the steeping liquor obtained after the light pressure cooking and the thread rolling refining extrusion can be stored and recycled and reused in the next light pressure cooking process, and the recycling of the steeping liquor can reduce 20-50% of the normal addition amount of the wood fiber softening agent in the next time.

Detailed Description

The technical solution of the present invention is further described in detail by the following embodiments.

A process for producing wood fibers comprising the steps of:

pre-steaming qualified wood chips, impregnating solution and 3% of wood fiber softening agent, and pre-steaming for 90 min to 140 ℃ under the normal pressure condition; wherein, the oven dry mass is measured according to the oven dry mass in the qualified wood chips: impregnation liquid = 3: 5; water can be used as the impregnation liquid;

the wood fiber softening agent comprises, by mass, 6 parts of phosphoric acid, 5 parts of formic acid, 5 parts of nitrous acid, 7 parts of lauryl alcohol polyoxyethylene ether (AEO), 5 parts of nonylphenol polyoxyethylene ether (APE), 6 parts of polyoxyethylene dodecylamine, 6 parts of polyoxyethylene amide, 4 parts of butyl carbitol, 6 parts of phenoxyethanol, 8 parts of sodium sulfite, 3 parts of sodium dodecyl sulfonate and 47 parts of deionized water;

the wood chips after the fiber preparation and pre-steaming are sequentially subjected to thread rolling, slight pressure cooking, thread rolling refinement, first-stage fine grinding and second-stage fine grinding to obtain finished fibers;

the impregnation liquid obtained after the impregnation liquid is reused and subjected to slight pressure cooking and thread rolling refining extrusion is stored for reuse and reused in the next slight pressure cooking process; the recycling of the impregnation liquid can reduce the normal addition of the wood fiber softening agent by 20-50% next time;

h is added into the disinfection and purification finished product fiber₂O₂Disinfectant and ClO₂The purifying agent is sterilized and purified for 80 min at normal temperature and normal pressure to promote the digestion and dissociation of the fine fibers; wherein H₂O₂6% of disinfectant, ClO₂The dosage of the purifying agent is 2.5 percent;

after screening, sterilizing and purifying, the finished fiber enters a latency storage pool to stay for 25 min, then screening is carried out to obtain good fiber, and the good fiber is concentrated, cleaned and dehydrated and then is sent to a fiber storage bin to be stored or is pressed into a fiber plate; fiber length: 1-15 mm; fiber bundle content: less than or equal to 0.2 percent; opacity: 92-94%; and (3) fracture length: 3.5-4.5 km.

Preferably, the qualified wood chips are prepared by sequentially carrying out procedures of peeling, chipping, screening, washing, dehydrating and drying on a wood raw material. The device mainly comprises a peeler, a chipping machine, a dust remover, an iron remover, a pre-cleaning system, a spiral dehydrator, a hot air drying channel and other auxiliary equipment, wherein the water content of the qualified wood chips is less than 50%, the length of the qualified wood chips is 10-70 mm, the width of the qualified wood chips is 5-30 mm, and the thickness of the qualified wood chips is 3-15 mm.

Preferably, qualified wood chips are conveyed to a pre-soaking system (a screw feeder and a pre-soaking device) of a pulping workshop, lifted to an upper outlet of the pre-soaking device by a pre-soaking screw, and conveyed to a No. 1 wood chip pre-steaming bin for a pre-steaming process, so that the wood fibers are loosened and softened.

After pre-steaming treatment, the wood chip fibers are in a loose and scattered state, then are taken out by a discharge screw at the bottom of a pre-steaming bin, enter a 1# double-screw thread rolling machine in a sealed normal pressure state, are rolled to obtain coarse thread fibers, enter a slight light pressure screw cooking bin, are cooked under the pressure of 0.05-0.2 mpa, then enter a 2# thread rolling re-crusher to further refine the fibers, and are sent into a 1# high-concentration refiner by a balance material plug feeder, wherein the concentration of the inlet fibers of the 1# high-concentration refiner is 30-40%; the wood fiber is conveyed to a cyclone separator through a material pushing spiral pipeline after passing through a No. 1 high-concentration refiner, steam and the wood fiber are separated, the wood fiber is conveyed to a No. 2 high-concentration refiner through a feeder, the concentration of the fiber at the inlet of the No. 2 high-concentration refiner is 35-45%, the wood fiber ground by the No. 2 high-concentration refiner is thermally recovered and conveyed to a No. 2 reaction bin for storage and dilution, the fiber is slightly diluted and stayed in the No. 2 reaction bin, the staying time is generally more than 10 min, the wood fiber can be adjusted according to actual conditions, the wood fiber concentration in the No. 2 reaction bin is diluted to 30-35%, the fiber concentration is increased to 40-50% through a double-screw extruder, and then the wood fiber is conveyed to a disinfection.

Preferably, a pH regulator is added at the inlet of the No. 1 high-consistency refiner, the pH is adjusted to be 7-8, and the fibers are fully mixed with the pH regulator in the coarse grinding area of the high-consistency refining, wherein the pH regulator can be selected from Na₂SiO₃、NaHCO₃、Na₂CO₃、NaOH、KHCO₃、K₂CO₃One or more of (a).

Further, after the wood fiber is disinfected and purified, the wood fiber is discharged to a latency storage pool through a screw, the concentration of the fiber is 2% -5%, the wood fiber stays in the latency storage pool for about 20-30 min, the wood fiber passes through a section of pressure screen, good fiber after the screen passes through a disc concentrator and then is pumped to a double-rod squeezing dehydrator for concentration through a medium concentration pump, the good fiber is fully mixed with water in a high concentration mixer and is washed, and the good fiber is dehydrated through a screw dehydrator and then is conveyed to a fiber storage bin for storage or is pressed into fiber plates for sale.

In addition, the slag fiber can enter a slag fiber storage tank, is diluted and then is pumped to a screw squeezer, is fed into a medium-concentration slag fiber grinder through a feeder for fine grinding again, the ground slag fiber enters a two-stage pressure screen for screening, good fiber is fed into a disc concentrator, and the slag fiber is discharged through a sand remover for additional treatment; the treated good fiber is sent to a disc concentrator of a screening and purifying section, then is sent to a double-roller squeezing dehydrator for concentration by a medium-concentration pump, is fully mixed with water in a high-concentration mixer, is washed by a spiral dehydrator, and is sent to a fiber storage bin for storage or is pressed into a fiber plate for sale.

Preferably, the mixed liquor generated in the working section is merged into a fiber mixed liquor storage pool of a wood fiber preparation workshop, the fiber is sent to a slag fiber treatment workshop for recovery after passing through a fiber recovery device, and the liquid is sent to a stock preparation pre-washing tank for reuse.

Example 2

This example is a lignocellulosic process substantially the same as example 1, except that:

pre-steaming qualified wood chips, impregnating solution and 1% of wood fiber softening agent, and pre-steaming for 50 min at 90-140 ℃ under the normal pressure condition; wherein, the oven dry mass is measured according to the oven dry mass in the qualified wood chips: impregnation liquid = 1: 5;

the wood fiber softening agent comprises, by mass, 10 parts of phosphoric acid, 1 part of formic acid, 3 parts of nitrous acid, 3 parts of lauryl alcohol polyoxyethylene ether (AEO), 9 parts of nonylphenol polyoxyethylene ether (APE), 2 parts of polyoxyethylene dodecylamine, 4 parts of polyoxyethylene amide, 2 parts of butyl carbitol, 7 parts of phenoxyethanol, 3 parts of sodium sulfite, 2 parts of sodium dodecyl sulfate and 55 parts of deionized water;

the wood chips after the fiber preparation and pre-steaming are sequentially subjected to thread rolling, slight pressure cooking, thread rolling refinement, first-stage fine grinding and second-stage fine grinding to obtain finished fibers;

h is added into the disinfection and purification finished product fiber₂O₂Disinfectant and ClO₂Sterilizing and purifying the purifying agent at normal temperature and normal pressure for 60 min; wherein H₂O₂The disinfectant dosage is 5%, ClO₂The dosage of the purifying agent is 3 percent;

after screening, sterilizing and purifying, the finished fiber enters a latency storage pool to stay for 20 min, then screening is carried out to obtain good fiber, and the good fiber is concentrated, cleaned and dehydrated and then is sent to a fiber storage bin to be stored or is pressed into a fiber plate.

Example 3

This example is a lignocellulosic process substantially the same as example 1, except that:

pre-steaming qualified wood chips, impregnating solution and 5% of wood fiber softening agent, and pre-steaming for 120 min at 90-140 ℃ under the normal pressure condition; wherein, the oven dry mass is measured according to the oven dry mass in the qualified wood chips: impregnation liquid = 5: 5;

the wood fiber softening agent comprises, by mass, 1 part of phosphoric acid, 10 parts of formic acid, 8 parts of nitrous acid, 1 part of lauryl alcohol polyoxyethylene ether (AEO), 9 parts of nonylphenol polyoxyethylene ether (APE), 8 parts of polyoxyethylene dodecylamine, 1 part of polyoxyethylene amide, 8 parts of butyl carbitol, 2 parts of phenoxyethanol, 8 parts of sodium sulfite, 1 part of sodium dodecyl sulfonate and 30 parts of deionized water;

the wood chips after the fiber preparation and pre-steaming are sequentially subjected to thread rolling, slight pressure cooking, thread rolling refinement, first-stage fine grinding and second-stage fine grinding to obtain finished fibers;

h is added into the disinfection and purification finished product fiber₂O₂Disinfectant and ClO₂Sterilizing and purifying the purifying agent at normal temperature and normal pressure for 130 min; wherein H₂O₂The disinfectant dosage is 5%, ClO₂The dosage of the purifying agent is 2 percent;

after screening, sterilizing and purifying, the finished fiber enters a latency storage pool to stay for 30min, then screening is carried out to obtain good fiber, and the good fiber is concentrated, cleaned and dehydrated and then is sent to a fiber storage bin to be stored or is pressed into a fiber plate.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.